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density
density
density Mass per unit volume, expressed in SI units as kilograms per cubic metre (kg/m
3). It is determined directly, or indirectly using gravity or
seismic velocity measurements. Typical densities in unconsolidated, wet sediments range between 1200 and 2600 kg/m
3, and 1000 to 2000 kg/m
3 if dry. Consolidated sediments range between 1600 and 3200 kg/m
3. (See also
NAFE—DRAKE RELATIONSHIPS for seismic determinations of the density of sediments.)
Basic igneous rocks range between 2300 and 3170 kg/m
3, and
metamorphic rocks are mostly in the range 2400–3100 kg/m
3, with
eclogite being one of the denser of the commoner metamorphic rocks, between 3200 and 3540 kg/m
3. The density of the upper
mantle increases with depth from about 3330 to 4000 kg/m
3, below which the lower mantle systematically increases to about 5400 kg/m
3 above the
core. The outer core density is about 10 100 to 12 100 kg/m
3; the inner core is more uniform, with a density of about 13 000 kg/m
3.
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Density dependence of ungulates and functional responses of wolves: effects on predator-prey ratios.(Statistical Data Included)
Magazine article from: Alces; 3/22/2001; ; 700+ words
; ...which integrate density-dependent growth...ungulate and wolf densities. Finally, we develop...carrying capacity, density dependence, functional...suggested that relative densities of predators and...or equilibrium density for wolves (Gasaway...ungulates to wolves. If densities of ...
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Density-dependent demography in two grasses: a five-year study.
Magazine article from: Ecology; 10/1/1995; ; 700+ words
; ...manipulations of the density of conspecific neighbors...of different natural densities on demographic parameters...indicate whether or not density dependence arising from...the direct effects of density with the effects of...Fowler 1990), Bouteloua densities were manipulated ...
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Density of conservation subdivisions reduced
Newspaper article from: The Milwaukee Journal Sentinel; 12/5/2001; ; 700+ words
; Density of conservation subdivisions reduced New...For months, the conservation subdivision density issue has been the source of sometimes...largely because of his reservations about density. Although aldermen in October approved...
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The relative densities of pharmaceutical powders, blends, dry granulations, and immediate-release tablets
Magazine article from: Pharmaceutical Technology; 4/1/2003; ; 700+ words
; ...density or even its density heterogeneity...True (absolute) density measurement. The true or absolute densities of finely divided...Bulk (envelope) density measurement for...bulk and tapped densities of powdered excipients...
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Density of prairie skinks (Eumeces septentrionalis) in old-field habitats
Magazine article from: The American Midland Naturalist; 7/1/2001; ; 700+ words
; ...ABSTRACT.-From 1996-1998 I estimated the density of prairie skinks (Eumeces septentrionalis...evaluated the influence of habitat characteristics on density. I estimated prairie skink density from a trapping grid using a mark-recapture...
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Density Changes of Iron during Morphological Healing Evolution of Internal Fatigue Microcracks
Magazine article from: Metallurgical and Materials Transactions; 12/1/2003; ; 700+ words
; ...and as-annealed specimens. The density of the specimens was measured with an electronic analytical balance. The density of the as-fatigued specimens decreased...after 2 hours of annealing time. The density of some specimens eventually approximates...
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Density-dependent fecundity by habitat heterogeneity in an increasing population of Spanish imperial eagles.
Magazine article from: Ecology; 1/1/1996; ; 700+ words
; ...territorial species, density-dependent depression...habitat quality. As densities increase, individuals...is expected between density and variance in fecundity...must increase with density, because at high densities more poor sites...
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Density: an extended investigation. (curriculum for teaching about density)
Magazine article from: Science Activities; 9/22/1996; ; 700+ words
; ...contains tables on density. Although we can easily...using values from these density tables, such activities...students should learn the densities of different substances...to develop a table of densities. Because the students...discovered the concept of density, there is no reason...
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Mammographic Density: Use in Risk Assessment and as a Biomarker in Prevention Trials1,2
Magazine article from: The Journal of Nutrition; 10/1/2006; ; 700+ words
; ...Abstract Introduction Mammographic breast density is positively associated with risk of...and physiologic factors that can affect density readings including film exposure, positioning...alcohol intake. If mammographic breast density is to be used as a response biomarker...
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Density and age of breeding pairs influence feral pigeon, Columba livia reproduction
Magazine article from: Folia Zoologica; 1/1/2007; ; 700+ words
; ...pigeon colonies. We found that density and the age of breeding pairs...colonies with lower breeding pair densities. These indicators were also...positively correlated with the density of birds. Breeding pairs had...compared with those of low density. The remaining factors studied...
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oceanic density and pressure
Book article from: The Oxford Companion to the Earth
...potential density for comparing the density of water in the deep ocean...to calculate the potential density at a comparable pressure level...if we were comparing the densities of water at a depth of 3000...to calculate the potential density relative to 3000 m, which...
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Density
Encyclopedia entry from: The Gale Encyclopedia of Science
...grams per cubic centimeter. The density of a material is also often compared to the density of water to give the material...gravities of 2 to 3, meaning they have densities of two to three times the density of water. The entire Earth has...
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density distribution within the Earth
Book article from: The Oxford Companion to the Earth
...constrains the estimates of density at all levels. If we...1980s), then M and the densities at all levels would...unaffected. The mean density is thus a scaling factor...model of the Earth's density profile were to be rescaled...controls the absolute densities in a model; C / Ma...
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Bone Density Test
Encyclopedia entry from: Gale Encyclopedia of Medicine, 3rd ed.
Bone Density Test Definition A bone density test, or scan, is designed to check for osteoporosis, a disease...age 50 die within one year. Most people today will get a bone density scan from a machine using a technology called Dual Energy X...
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Density and Volume
Book article from: Science of Everyday Things
...the interesting things about density, as distinguished from mass...in mass and volume, but the density of both samples is the same...discussed below, the known densities of various materials make it...sometimes hard to comprehend, and density requires an explanation in...
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