Image Bonedensity scanner.jpg right thumb A scanner used to measure bonedensity with dual energy X ray absorptiometry . Bonedensity or bonemineraldensity is a medical term normally referring to the amount of mineral matter per square centimeter of bone s. ref MeshName BoneDensity ref Bonedensity ... Improving clinical decisions for women at risk of osteoporosis dual femur bonemineraldensity testing ... bonemineraldensity BMC W g cm sup 2 sup BMC bonemineral content g cm W width at the scanned ... indicate the amount one s bonemineraldensity varies from the mean. Negative scores indicate lower bonedensity, and positive scores indicate higher. T score The T score is a comparison of a patient ... Osteoporosis and bonemineraldensity. accessdate 2008 05 11 last Richmond first Bradford date 2007 ..., Leslie WD title Low bonemineraldensity and fracture burden in postmenopausal women journal Canadian ... bonedensity is not the true physics physical density of the bone, which would be computed ... and lumbar spine are not accessible. Average density is around 1500 kg m sup 3 sup There is a statistics statistical association between poor bonedensity and higher probability of fracture .... Bonedensity measurements are used to screen women for osteoporosis risk and to identify those who might benefit from measures to improve bone strength. Terms Results are often reported in 3 terms ..., the thickness of tissue overlying the bone, and other factors extraneous to the bones. Bonedensity ... density is a poorer indicator of bone strength. Reference standards for some populations e.g., children ... cost effective approach to measure bonedensity. ref name urlBone densitometry cite web url http ... The test works by measuring a specific bone or bones, usually the spine, hip, and wrist. The density ... is defined as 2.5 or lower, meaning a bonedensity that is two and a half standard deviations ... Bone cartilage physiology Category Density Category Skeletal system de Knochenmineraldichte es Densitometr a ... more details
Image Bertazzo S SEM deproteined bone cranium rat x10k.jpg thumb Electronic micrography 10000x magnification of Bonemineral. Bonemineral also called inorganic bone phase, bone salt or bone apatite is the inorganic component of bone. Bonemineral is formed from carbonated hydroxyapatite ref Legros, R., N. Balmain, et al. 1987 . Age Related Changes in Mineral of Rat and Bovine Cortical Bone. Calcified Tissue International 41 3 137 144. ref ref Field, R. A., M. L. Riley, et al. 1974 . Bone Composition in Cattle, Pigs, Sheep and Poultry. Journal of Animal Science 39 3 493 499. ref with lower crystallinity. ref Legros, R., N. Balmain, et al. 1987 . Age Related Changes in Mineral of Rat and Bovine Cortical Bone. Calcified Tissue International 41 3 137 144. ref ref Bertazzo, S. & Bertran, C. A. 2006 . Morphological and dimensional characteristics of bonemineral crystals. Bioceramics 18, Pts 1 and 2 309 311 7 10 ref Bonemineral is formed from globular and plate structures ref Bertazzo, S., Bertran, C. A. & Camilli, J. A. 2005 . Morphological characterization of femur and parietal bonemineral of rats at different ages. Bioceramics 18, Pts 1 and 2 309 311 11 14. ref ref Bertazzo, S. & Bertran, C. A. 2006 . Morphological and dimensional characteristics of bonemineral crystals. Bioceramics 18, Pts 1 and 2 309 311 3 6. ref distributed among the collagen fibrils of bone and forming yet a larger structure. References Reflist DEFAULTSORT BoneMineral Category Bone products musculoskeletal stub es Mineral de hueso sr Ko tani mineral ... more details
third party sources date October 2011 orphan date April 2008 The International Bone and Mineral Society IBMS is the oldest and the largest international network of researchers, clinicians, companies and societies in the field of bone and mineral metabolism, including osteoporosis and other diseases of bone. Mission statement IBMS is the international organization that facilitates the generation and dissemination of knowledge of bone and mineral metabolism through communication, community, training, and multi disciplinary meetings throughout the world. History IBMS started as the Parathyroid Conferences, a triennial event from 1960 to 1977. In 1980, the group was incorporated in Quebec, Canada under the name International Conferences on Calcium Regulating Hormones ICCRH . In 1995 the name was changed to IBMS and it was registered as a 501 c 3 organization with headquarters in Washington, DC . IBMS has been in the forefront of the field and currently holds annual scientific meetings and publishes the scientific journal Bone . IBMS also supports and publishes IBMS BoneKEy , the only free, open access knowledge environment in the field of bone and mineral metabolism. IBMS BoneKEy IBMS BoneKEy is the largest open access knowledge environment in the field of bone and mineral metabolism. With over 18,000 subscribers, IBMS BoneKEy provides its members not only with an extensive online directory and calendar of events but also with path breaking Perspectives, original Commentaries, and up to date News. BONEBONE is the official journal of the International Bone and Mineral Society.. External links http www.ibmsonline.org IBMS Website http ees.elsevier.com boneBone http www.bonekey ibms.org BoneKEy DEFAULTSORT International Bone And Mineral Society Category Non profit organizations based in Washington, D.C. Category International scientific organizations Category Osteology Category 501 c 3 nonprofit organizations ... more details
The American Society for Bone and Mineral Research ASBMR is a professional, scientific and medical society ... annual scientific meetings, an official journal Journal of Bone and Mineral Research , the Primer on the Metabolic Bone Diseases and Disorders of Mineral Metabolism , advocacy and interaction with government ... society in the field of bone and mineral metabolism through promoting excellence in bone and mineral ... of new knowledge in bone and mineral metabolism. The ASBMR is proactive in shaping research ... to promote excellence in bone and mineral research and to facilitate the translation of that research ... helped bolster a burgeoning new field bone and mineral research. The field grew rapidly during ... and experimental scientists involved in the study of bone and mineral metabolism where scientists ... society that would promote the study of the expanding bone and mineral field. Three years ... monthly Journal of Bone and Mineral Research JBMR which would later become a monthly publication. In 1984 ... students, and fellows to the field of bone and mineral research. In the 1990s, the field experienced ... and other bone diseases, resulting in increased interest and research in bone and mineral metabolism ... bone and mineral research and nurturing young investigators in the field, but now also dedicating ... and Primer on the Metabolic Bone Diseases and Disorders of Mineral Metabolism , and made new education ... countries and the success of its publications, the Journal of Bone and Mineral Research and the Primer on Metabolic Bone Disease and Disorders of Mineral Metabolism , ASBMR continues to grow and remains a pioneering leader in the field of bone and mineral metabolism. ASBMR maintains its dedication ... is on the ASBMR website at www.asbmr.org awards. Journal The Journal of Bone and Mineral ... cited of the specialized journals dedicated to bone and mineral research, and is the primary source ... bone and mineral metabolism, and the pathophysiology and treatment of disorders of bone and mineral ... more details
about mass density semiprotected small yes pp move indef The mass density or density of a material is defined as its mass per unit volume . The symbol most often used for density is the Greek letter Rho letter rho . In some cases for instance, in the United States oil and gas industry , density is also ... Density definition in Oil Gas Glossary publisher Oilgasglossary.com date accessdate 2010 09 14 ref ... different densities, so density is an important concept regarding buoyancy , purity and packaging . Osmium .... If the average density including any air below the waterline of an object is less than water 1000 ... cases density is expressed as the dimensionless quantities specific gravity SG or relative density RD , in which case it is expressed in multiples of the density of some other standard material ... in water. The mass density of a material varies with temperature and pressure. The variance is typically ... decreases the volume of the object and therefore increase its density. Increasing the temperature of a substance with some exceptions decreases its density by increasing the volume of that substance ... to top of the fluid due to the decrease of the density of the heated fluid. This causes it to rise relative to more dense unheated material. The reciprocal of the density of a substance is called its specific volume , a representation commonly used in thermodynamics . Density is an intensive property in that increasing the amount of a substance does not increase its density rather it increases its ... in the Bath , Scientific American , December 2006. ref Mathematically, density is defined as mass divided by volume math rho frac m V , math where math is the density, math m is the mass, and math V is the volume. From this equation, mass density must have units of a unit of mass per unit of volume ... number of units for mass density in use. The SI unit of kilogram per cubic metre math kg m and the cgs unit of gram per cubic centimetre math g cm are probably the most common used units for density ... more details
gravity relates the mineral mass to the mass of an equal volume of water, namely the density of the material ...pp semi small yes other uses File Different minerals.jpg 250px thumb An assortment of minerals. A mineral ... of minerals is called mineralogy . Mineral definition and classification To be classified as a true mineral, a substance must be a solid and have a crystalline structure. It must also be a naturally ... Association approved the following definition in 1995 A mineral is an element or chemical compound ... Nickel cite journal last Nickel first Ernest H. title The definition of a mineral journal The Canadian ... and classification scheme, Biogenic substance biogenic materials were excluded from the mineral kingdom ... of the compound, then the product can be accepted as a mineral. ref name Nickel rp 690 However ... solids as potential minerals and includes Biomineralization biominerals in the mineral kingdom, which ... requires a expanded definition of a mineral as An element or compound, amorphous or crystalline, formed through biogeochemical processes. ref name Skinner05 rp 621 Mineral classification schemes and their definitions are evolving to match recent advances in mineral science. More recent classifications ... includes a very rare group of minerals with hydrocarbons . The IMA Commission on New Minerals and Mineral Names recently adopted in 2009 a hierarchical scheme for the naming and classification of mineral ... 10 20. ref According to these new rules, mineral species can be grouped in a number of different ... first4 G. title The standardisation of mineral group hierarchies application to recent nomenclature ... that may make Nickel s 1995 ref name Nickel biogenic mineral exclusion obsolete and Skinner s 2005 biogenic mineral inclusion a necessity. ref name Skinner05 cite journal last1 Skinner first1 H .... Mineral forming microorganisms inhabit the areas that this working group deals with. These organisms ... and geologists have recently started to research and appreciate the magnitude of mineral geoengineering ... more details
fracture fracture . In osteoporosis, the bonemineraldensity BMD is reduced, bone microarchitecture ... is defined by the World Health Organization WHO in women as a bonemineraldensity 2.5 standard ... organs of the body, produce red blood cell red and white blood cell s and store mineral s. Bone tissue ... secreted against the mineral substrate. Molecular structure Matrix The majority of bone is made of the bone ... magnification of Bonemineral The inorganic composition of bonebonemineral is formed from carbonated ..., bonemineral is formed from globular and plate structures, ref name r1 ref cite journal doi 10.4028 ... BoneMineral of Rats at Different Ages year 2006 last1 Bertazzo first1 S. last2 Bertran first2 C.A. ... disorders of bone include Bone fractures Bonemineral Osteomyelitis Osteosarcoma Osteogenesis imperfecta ... materials including animations by the American Society for Bone and Mineral Research http silver.neep.wisc.edu ...about the skeletal organ other uses Bone disambiguation and Bones disambiguation the tissue Osseous tissue ... functions . One of the types of tissue that makes up bone is the mineralized osseous tissue , also called bone tissue, that gives it rigidity and a Honeycomb geometry honeycomb like three dimensional internal structure. Other types of tissue found in bones include bone marrow marrow , endosteum and periosteum .... The largest bone in the human body is the femur and the smallest bones are auditory ossicles. ref ... in three dimensional space. The interaction between bone and muscle is studied in biomechanics ... hearing . Synthetic Blood production the Bone marrow marrow , located within the medullary cavity of long bones and interstices of cancellous bone, produces blood cells in a process called hematopoiesis . Metabolic Mineral storage bones act as reserves of minerals important for the body, most notably calcium and phosphorus . Growth factor storage mineralized bone matrix stores important growth factors such as insulin like growth factors, transforming growth factor, bone morphogenetic protein ... more details
To the Bone may refer to To the Bone The Kinks album To the Bone The Kinks album To the Bone Kris Kristofferson album To the Bone Kris Kristofferson album To the Bone Law & Order Criminal Intent To the Bone Law & Order Criminal Intent , an episode of Law & Order Criminal Intent ToTheBones , an English rock band disambig ... more details
Infobox Book name In the Bone title orig translator image Image In the bone.jpg 200px image caption Cover of the first edition author Gordon R. Dickson illustrator cover artist Richard Corben country United States language English language English series genre Science fiction short stories publisher Ace Books release date 1987 english release date media type Print Paperback pages 228 pp isbn 0 441 37049 7 oclc 15339637 preceded by followed by In the Bone The Best Science Fiction of Gordon R. Dickson is a collection of science fiction stories by Gordon R. Dickson . It was first published by Ace Books in 1987 and expands Dickson s earlier collection, Gordon R. Dickson s SF Best . Most of the stories originally appeared in the magazines Analog Science Fiction and Fact , Fantasy and Science Fiction , Satellite and if magazine If . Contents Twig God Bless Them Hilifter Brother Charlie Act of Creation Idiot Solvant Call Him Lord Tiger Green Of the People Dolphin s Way In the Bone References cite web last Brown first Charles N. authorlink Charles N. Brown coauthors William G. Contento title The Locus Index to Science Fiction 1984 1998 work publisher date url http www.locusmag.com index t58.htm A6724 format doi accessdate 2008 01 21 cite web last first authorlink coauthors title Internet Speculative Fiction Database work publisher date url http www.isfdb.org cgi bin pl.cgi?87IntheBone format doi accessdate 2008 01 21 Category 1987 short story collections Category Short story collections by Gordon R. Dickson ... more details
Infobox Hollywood cartoon cartoon name A Bone for a Bone series Looney Tunes Goofy Gophers image A Bone for a Bone title card.png caption The title card for A Bone for a Bone . director Friz Freleng I. Freleng story artist Ben Hardaway J.B. Hardaway animator Virgil Ross br Arthur Davis animator Arthur Davis br Manuel Perez br Ken Champin layout artist Hawley Pratt background artist Paul Julian voice actor Mel Blanc br Stan Freberg uncredited musician Carl Stalling producer Eddie Selzer uncredited studio Warner Bros. Cartoons distributor Warner Bros. Pictures br The Vitaphone Corporation release date April 7, 1951 color process Technicolor runtime 6 57 movie language English preceded by A Ham in a Role followed by I Gopher You A Bone for a Bone is a Looney Tunes Short subject short starring the Goofy Gophers . The cartoon, released in 1951, was directed by Friz Freleng and released by Warner Bros. Pictures , and was the first of four Goofy Gophers cartoon directed by Freleng, and would be the final work by Ben Hardaway J.B. Hardaway at the Warner Bros. studio, having returned after almost a decade at the Walter Lantz studio. Plot The Gophers Mac and Tosh are playing a Gin rummy gin game in their hole in the ground outside a house, where Tosh loses his fifth game in a row, when Geo P. Dog otherwise known as The Barnyard Dawg in the Foghorn Leghorn series digs a hole and dumps a bone on the Gophers and then dirt as he fills the bone in. Geo does remove the bone upon Tosh s request, but realizing that it was gophers who asked him to move the bone, he returns to the same hole to dig the bone. This time, Mac goes up, only to be grabbed by Geo. Mac then yells for help, which arrives in the form of Tosh and a hammer, which Tosh uses to knock Geo s head into his collar, allowing the Gophers to return to their hole and escape the dog, but not before the Gophers have an argument ... Bone for a Bone, A Category 1951 films Category Looney Tunes shorts Category Films directed ... more details
Bulk density is a property of powder substance powder s, granular material granules and other divided solid s, especially used in reference to mineral components soil , gravel , chemical substance s, pharmaceutical ingredient s, foodstuff or any other masses of corpuscular or particulate matter . It is defined as the mass of many particle s of the material divided by the total volume they occupy. The total ... year 1960 edition 6th ref Bulk density is not an intrinsic property of a material it can change depending ... bulk density if the cylinder is disturbed, the powder particles will move and usually settle closer together, resulting in a higher bulk density. For this reason, the bulk density of powders is usually reported both as freely settled or poured density and tapped density where the tapped density refers to the bulk density of the powder after a specified compaction process, usually involving vibration of the container. Soil The bulk density of soil depends greatly on the mineral make up of soil and the degree of Soil compaction compaction . The density of quartz is around 2.65g cm but the bulk density of a mineral soil is normally about half that density, between 1.0 and 1.6g cm . Soils high in organics and some friable clay may have a bulk density well below 1g cm Bulk density of soil ... depth and horizon. The samples are then oven dried and weighed. Bulk density mass of soil volume as a whole math rho frac M s V t math The bulk density of soil is Inverse relationship inversely ... density. Bulk density of a region in the interior of the earth is also related to the seismic ... . The higher the density, the faster the velocity. See also Brazil nut effect Characterisation of pore space in soil Effective porosity Particle density Porosity Notes reflist External links http ... How to measure dry bulk density http www.powtec.de download smg engl.pdf Determination of bulk density Category Density Category Particulates Category Soil physics ca Densitat aparent de Rohdichte ... more details
unsourced date March 2009 Well logging Density logging is a well logging tool determining rock bulk density along a wellbore . This is the overall density of a rock including solid matrix and the fluid enclosed in pores. Geologically, bulk density is a function of the density of the minerals forming a rock i.e. rock matrix matrix and the enclosed volume of free fluids porosity . General tool design Modern density logging tools, generally shares the same design principles independent of manufacturer. Tool consist of housing with electronics cartridges and a sonde part. Sonde part has a measuring ... to ensure it s contact with the borehole. Density measurements are extremely sensitive to shape of the borehole readings in large washouts are irrelevant due to very shallow depth of investigation of density ..., are counted as an indication of formation stratigraphy formation density. The number of Compton scattering collisions is related directly to the number of the electron density of the formation. Consequently, the electron density determines the response of the density tool. Electron density is related ... is them molecular weight of the compound. Inferring porosity from bulk density Assuming that the measured bulk density math rho text bulk math only depends on rock matrix matrix density math rho text matrix math and fluid density math rho text fluid math , and that these values are known along the wellbore ... bulk rho text matrix rho text fluid math Common values of matrix density math rho text matrix math in gram g cm are Quartz sand 2.65 Limestone 2.71 Dolomite 2.87 Density of clay minerals is highly variable, and depends on depositional environment, overburden pressure, type of clay mineral and many other factors. It can vary from 2.1 Montmorillonite to 2.76 Chlorite . A fluid bulk density math ... higher density. For flushed gas or oil reservoirs, even lower math rho text fluid math values should be assumed depending on the hydrocarbon density and residual saturation. In some applications ... more details
In mathemtics, density theorem may refer to Density conjecture for Kleinian groups Chebotarev s density theorem in algebraic number theory Jacobson density theorem in algebra Kaplansky density theorem in algebra Lebesgue s density theorem mathdab ... more details
Relative density , or specific gravity , ref name specificgravity1 cite book last Dana first Edward Salisbury ... ?id YCSSolzuu9IC&pg PP1 isbn 0471348562 ref is the ratio of the density mass of a unit volume of a substance to the density of a given reference material. Specific gravity usually means relative density with respect to water. The term relative density is often preferred in modern scientific usage. If a substance s relative density is less than one then it is less dense than the reference if greater than 1 then it is denser than the reference. If the relative density is exactly 1 then the densities ... is water then a substance with a relative density or specific gravity less than 1 will float in water. For example, an ice cube, with a relative density of about 0.91, will float. A substance with a relative density greater than 1 will sink. Temperature and pressure must be specified for both the sample ... it is not, it is more usual to specify the density directly. Temperatures for both sample and reference ..., brewers wort , must , etc. and acids. Basic formulas Relative density RD or specific gravity ... mathrm substance rho mathrm reference , math where RD is relative density, sub substance sub is the density of the substance being measured, and sub reference sub is the density of the reference. By convention , the Greek letter Rho letter rho , denotes density. The reference material can be indicated using subscripts RD sub substance reference sub , which means the relative density of substance ... at which water reaches its maximum density . In International System of Units SI units, the density ... cm sup 3 sup , which makes relative density calculations particularly convenient the density of the object only needs to be divided by 1000 or 1, depending on the units. The relative density of gases ... kPa absolute, which has a density of 1.205 kg m sup 3 sup . Relative density with respect to air ... Density for a table of the measured densities of water at various temperatures. The density of substances ... more details
wiktionary density wiktionary dense Density and dense usually refer to a measure of how much of some entity is within a fixed amount of space. Types of density include In physics , density of mass Density , mass per volume Area density or surface density, mass over a two dimensional area Linear density , mass over a one dimensional line Bulk density , mass of many particles of a particulate solid or a powder divided by the total volume they occupy Particle density or true density, density of the particles that make up a particulate solid or a powder Relative density or specific gravity , a measure of density in comparison to the density of something else Vapour density , a relative density used for gases Planck density , Planck mass per Planck length In physics, densities of entities other than mass Number density , number of particles per unit volume, area, or length Current density , the ratio of electric current to area Charge density , the electric charge per volume Energy density , potential energy per unit volume or mass, depending on context Force density , force per unit volume Optical density, the absorbance of an element In mathematics Dense set and nowhere dense set in topology Dense set Density of a topological space Schnirelmann density in number theory Natural density also called asymptotic density in number theory Lebesgue s density theorem in measure theory Probability density function , a function which maps probabilities across the real line and whose integral is 1 Density estimation is the construction of an estimate of a probability density function Kernel density estimation , used in statistics to estimate a probability density function of a random variable Tensor density in differential geometry Dense graph Density in graph theory, the fraction of possible ... coinitial subset in the theory of forcing mathematics forcing . Density polytope in geometry Density on a manifold Dense submodule in abstract algebra In other scientific fields Population density ... more details
The physiological density or real population density is the Population number of people per unit area of arable land . ref http www.valpo.edu geomet geo courses geo101 glossary.html p GEO 101 World Human Geography Glossary ref A higher physiological density suggests that the available agricultural land is being used by more and may reach its output limit sooner than a country that has a lower physiological density. See also Population density List of countries by real population density based on food growing capacity List of countries by physiological density References Reflist Population Category Demographics Category Demography ... more details
The particle density or true density of a particulate solid or powder, is the density of the particles that make up the powder, in contrast to the bulk density , which measures the average density of a large volume of the powder in a specific medium usually air . The particle density is a relatively well defined quantity, as it is not dependent on the degree of compaction of the solid, whereas the bulk density has different values depending on whether it is measured in the freely settled or compacted state tap density . However, a variety of definitions of particle density are available, which differ in terms of whether pores are included in the particle volume, and whether voids are included. Measurement The measurement of particle density can be done in a number of ways Archimedes principle The powder is placed inside of known volume, and weighed. The Relative density Pycnometer Pycnometer is then filled with a fluid of known density, in which the powder is not soluble. The volume of the powder is determined by the difference between the volume as shown by the pycnometer, and the volume ... volume, is to suspend a known mass of particles in molten wax of known density, allow any bubbles .... A slurry of the powder in a liquid of known density can also be used with a hydrometer to measure particle density by buoyancy . Another method based on buoyancy is to measure the weight of the sample in air, and also in a liquid of known density. A column of liquid with a density gradient can ... density at the bottom is higher than that of the solid, and the minimum density is lower. If a small ... the liquid density is equal to the particle density. Volumetric measurement A gas pycnometer can ... characterization of the sample s porosity. See also Bulk density Porosity Number density External links http www.particletesting.com docs density determinations.pdf An excellent overview of particle density and porosity measurements, with references Category Density Category Particulates de Reindichte ... more details
The maximum density of a Chemical substance substance is the highest attainable density of the substance under given conditions. Attaining maximum density Almost all known substances undergo thermal expansion in response to heating, meaning that a given mass of substance contracts to a low volume at low temperature s, when little thermal energy is present. Substances, especially fluid s in which intermolecular force s are weak, also undergo compression physical compression upon the application of pressure . Nearly all substances therefore reach a density maximum at very low temperatures and very high pressures, characteristic properties of the solid State of matter state of matter . Water see Water molecule Density of water and ice An especially notable irregular maximum density is that of water , which reaches a density peak at convert 3.98 C F . This has important ramifications in Earth s ecosystem . Fact date March 2007 Citation help is here http www.google.com search?&q Wetzel 3.98 Density of water References Unreferenced date December 2006 references Reflist See also List of elements by densityDensity Specific Gravity Specific weight Charge density Buoyancy Hydrometer Category Density Category Condensed matter physics Category Physical chemistry Category Physical quantities physical chemistry stub ... more details
Probability density may refer to Probability density function in probability theory The product of the probability amplitude with its complex conjugate in quantum mechanics disambig cs Hustota pravd podobnosti ... more details
Unreferenced stub auto yes date December 2009 In fluid mechanics , the force density is the negative gradient of pressure. It has the physical dimensions of force physics force per unit volume . Force density is a vector field representing the flux density of the hydrostatic force within the bulk of a fluid . Force density is represented by the symbol f , and given by the following equation, where P is the pressure math mathbf f nabla P math . The net force on a differental volume element dV of the fluid is math d mathbf F mathbf f dV math Thus, the force density at a point in a fluid, divided by the density , is the acceleration of the fluid at that point. DEFAULTSORT Force Density Category Density Fluiddynamics stub es Densidad de fuerza ar ... more details
Orphan date February 2009 The orthobaric density of a compound is the density of the coexisting phase matter phases liquid , gas , or solid at a given temperature. Liquid Gas Equilibrium For any temperature below the critical point thermodynamics critical point , the density of the gas will be less than that of the liquid, at the critical point the density of the liquid and gas phases are identical and the compound becomes a supercritical fluid . ref McQuarrie, Donald A. and Siman, John D., Physical Chemistry A Molecular Approach . Sausalito University Science Books, 1997. ref References reflist Category Density physics stub ... more details
For computer memory comparisons, see computer storage density . For other meanings, see Density disambiguation The area density also known as areal density, surface density, or superficial density of a two dimensional object is calculated as the mass per unit area . The SI derived unit is kilogram per square metre kg m sup &minus 2 sup . It can be calculated as math rho A frac M A math or math rho A rho cdot l math where sub A sub average area density M total mass of the object A total area of the object average density l average thickness of the object A special type of area density is called columnar density it is obtained integrating density volumetric density math rho math over a vertical column ref Cite book last1 Visconti first1 Guido title Fundamentals of physics and chemistry of the atmosphere date 2001 publisher Springer location Berlin isbn 978 3 540 67420 7 pages 470 ref math rho A int rho dz, math where math z math denotes the vertical coordinate e.g., height or depth . An example is the Dobson unit for atmospheric ozone. Columnar density math rho A math is closely related to the vertically averaged volumetric density math bar rho math as math bar rho rho A Delta z, math where math Delta z int 1 dz math notice that math bar rho math , math rho A math , and math Delta z math have units of, e.g., g m sup 3 sup , g m sup 2 sup , and m, respectively. Usage The area density is often used to describe the thickness of paper, e.g. 80 g m sup 2 sup is very common. It is also an important quantity for the Absorption electromagnetic radiation absorption of radiation . When studying bodies falling through air, area density is important because resistance depends on area, and gravitational force is dependent on mass. The Body mass index is in terms of area density. Citation needed date April 2011 See talk page References references DEFAULTSORT Area Density Category Density Category Classical mechanics Classicalmechanics stub ar de Massenbelegung es ... more details
Vapour density or vapor density is the density of a vapour in relation to that of hydrogen . It may be defined as mass of a certain volume of a substance divided by mass of same volume of hydrogen. vapour density mass of n molecules of gas mass of n molecules of hydrogen Therefore vapour density molar mass of gas molar mass of H sub 2 sub vapour density molar mass of gas 2.0016 vapour density × molar mass and thus molar mass 2 × vapour density Alternative definition In many web sources, particularly in relation to safety considerations at commercial and industrial facilities in the U.S., vapour density is defined with respect to air, not hydrogen. ref http www.msdsonline.com CustomerSupport GlossaryOfTerms VaporDensity.aspx MSDS Glossary of Terms Vapor Density ref Air is given a vapour density of one. For this use, air has a molecular weight of 29 atomic mass units, and all other gas and vapour molecular weights are divided by this number to derive their vapour density. ref http www.firenuggets.com x ARDSIllIIlllllIIIllIlIlIIIllllIllIl peterson9.htm HazMat Math Calculating Vapor Density ref For example, acetone has a vapour density of 2 ref http hazard.com msds mf baker baker files a0446.htm MSDS Acetone ref in relation to air. That means acetone vapour is twice as heavy as air. This can be seen by dividing the molecular weight of Acetone, 58.1 ref http www.cdc.gov niosh npg npgd0004.html NIOSH Pocket Guide Acetone ref by that of air, 29, which equals 2. With this definition, the vapour density would indicate whether a gas is denser greater than one or less dense less than one than air. The density has implications for container storage and personnel safety if a container can release a dense gas, its vapour could sink and, if flammable, collect until it is at a concentration ... density being used in their specific context. See also relative density also known as specific gravity Victor Meyer apparatus References references Category Density fr Densit de vapeur ... more details
cleanup date August 2008 In computational linguistics , lexical density constitutes the estimated measure of content per functional grammatical and lexical units lexeme s in total. It is used in discourse analysis as a descriptive parameter which varies with register and genre. Spoken texts tend to have a lower lexical density than written ones, for example. Lexical density may be determined thus math Ld Nlex N x 100 math Where Ld the analysed text s lexical density NLex the number of lexical word tokens nouns, adjectives, verbs, adverbs in the analysed text N the number of all tokens total number of words in the analysed text small Please note that the variable symbols applied herein are by no means conventional, they are simply random chosen designations that serve to illustrate the example in question. small See also Content analysis Further reading Ure, J 1971 . Lexical density and register differentiation. In G. Perren and J.L.M. Trim eds , Applications of Linguistics , London Cambridge University Press. 443 452. External links http www.usingenglish.com showdef.php?p lexical density test.html Lexical Density Test definition NOTE This page gives an incorrect formula and confuses lexical density with type token ratio. http www.textalyser.net Lexical density Textalyser Category Computational linguistics Category Applied linguistics Category Formal sciences ling stub de Lexikalische Dichte ... more details
Urban density is a term used in urban planning and urban design to refer to the number of people inhabiting ... density . Urban density is considered an important factor in understanding how cities function. Research related to urban density occurs across diverse areas, including economics, health, innovation, psychology and geography as well as sustainability . Urban density and sustainability File Revised petrol use urban density.JPG thumb A graph showing the relationship between urban density and petrol use. It is commonly asserted that higher density cities are more sustainable than low density cities ... growth . However, the link between urban density and aspects of sustainability remains a contested ... experts on sustainable urbanism , including prominent urban designer Jan Gehl , argue that low density ... the total energy consumption of a city and its overall urban density, i.e. the lower the density ... 1559636602 ref Measuring urban density Urban density is a very specific measurement of the population ..., agriculture and water bodies. There are a variety of other ways of measuring the density of urban areas ... on Residential density the number of dwelling units in any given area Population density the number of people in any given area employment density the number of jobs in any given area Gross density any density figure for a given area of land that includes uses not necessarily directly relevant to the figure usually roads and other transport infrastructure Net density a density figure for a given area of land that excludes land not directly related to the figure. Weighted density a density metric which measures the density at which the average citizen lives. It is determined by calculating the standard density of each census tract, assigning each a weight equal to its share of the total population, and then adding the segments. See also List of cities proper by population density Transportation ... conc8en urbanenergy.html Urban Density and Energy Consumption http www.planetizen.com node 23176 Deriving ... more details
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