# density

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density
/den"si tee/, n., pl. densities.
1. the state or quality of being dense; compactness; closely set or crowded condition.
2. stupidity; slow-wittedness; obtuseness.
3. the number of inhabitants, dwellings, or the like, per unit area: The commissioner noted that the population density of certain city blocks had fallen dramatically.
4. Physics. mass per unit volume.
5. Elect.
a. the quantity of electricity per unit of volume at a point in space, or the quantity per unit of area at a point on a surface.
6. the degree of opacity of a substance, medium, etc., that transmits light.
7. Photog. the relative degree of opacity of an area of a negative or transparency, often expressed logarithmically.
8. Computers. a measure of the compactness of data stored on an external storage medium, as disk or tape, or displayed on a CRT or other screen.
[1595-1605; < L densitas, equiv. to dens(us) DENSE + -itas -ITY]

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I
Mass of a unit volume of a material substance.

It is calculated by dividing an object's mass by its volume. In the International System of Units, and depending on the units of measurement used, density can be expressed in grams per cubic centimetre (g/cm3) or kilograms per cubic metre (kg/m3). The expression "particle density" refers to the number of particles per unit volume, not to the density of a single particle. See also specific gravity.
II
(as used in expressions)

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▪ chemistry and physics
mass of a unit volume of a material substance, expressed as kilograms per cubic metre in MKS or SI units; the densities of common solids, liquids, and gases are listed in textbooks and handbooks. Density offers a convenient means of obtaining the mass of a body from its volume or vice versa; the mass is equal to the volume multiplied by the density, while the volume is equal to the mass divided by the density. The weight of a body, which is usually of more practical interest than its mass, can be obtained by multiplying the mass by the acceleration of gravity. Tables that list the weight per unit volume of substances are also available; this quantity has various titles, such as weight density, specific weight, or unit weight. See also specific gravity. The expression particle density refers to the number of particles per unit volume, not to the density of a single particle.

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Universalium. 2010.

Synonyms:

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• Density 21.5 — is a piece of music for solo flute written by Edgard Varèse in 1936 and revised in 1946. The piece was composed at the request of Georges Barrère for the premiere of his platinum flute, the density of platinum being close to 21.5 grammes per… …   Wikipedia

• Density — 21.5 ist eine Komposition für Querflöte solo von Edgar Varèse. Das Stück gilt als richtungsweisende Komposition des 20. Jahrhunderts innerhalb des vergleichsweise schmalen Repertoires für Flöte solo. Der aus Paris stammende Komponist Edgar Varèse …   Deutsch Wikipedia

• Density 21.5 — ist eine Komposition für Querflöte solo von Edgar Varèse. Das Stück gilt als richtungsweisende Komposition des 20. Jahrhunderts innerhalb des vergleichsweise schmalen Repertoires für Flöte solo. Der aus Paris stammende Komponist Edgar Varèse,… …   Deutsch Wikipedia

• Density — Den si*ty (d[e^]n s[i^]*t[y^]), n. [L. densitas; cf. F. densit[ e].] 1. The quality of being dense, close, or thick; compactness; opposed to {rarity}. [1913 Webster] 2. (Physics) The ratio of mass, or quantity of matter, to bulk or volume, esp.… …   The Collaborative International Dictionary of English

• density — [den′sə tē] n. pl. densities [Fr densité < L densitas] 1. the quality or condition of being dense; specif., a) thickness; compactness b) stupidity c) Photog. degree of opacity of a negative 2. quantity or number per unit, as of area …   English World dictionary

• Density — Density. См. Плотность абсолютная. (Источник: «Металлы и сплавы. Справочник.» Под редакцией Ю.П. Солнцева; НПО Профессионал , НПО Мир и семья ; Санкт Петербург, 2003 г.) …   Словарь металлургических терминов

• density — I noun closeness, compactness, concentration, concretion, intransparency, opacity, opaqueness, palpability, solidity, thickness II index mass (weight), opacity Burton s Legal Thesaurus. William C. Burton …   Law dictionary

• density — c.1600, from Fr. densité (16c.), from O.Fr. dempsité (13c.), from L. densitas thickness, from densus thick, dense (see DENSE (Cf. dense)) …   Etymology dictionary

• density — [n] bulk, mass body, closeness, compactness, concretion, consistency, crowdedness, denseness, frequency, heaviness, impenetrability, massiveness, quantity, solidity, substantiality, thickness, tightness; concept 722 Ant. openness, sparsity,… …   New thesaurus

• density — ► NOUN (pl. densities) 1) the degree of compactness of a substance; mass per unit volume. 2) the quantity of people or things in a given area or space …   English terms dictionary

• Density — This article is about mass density. For other uses, see Density (disambiguation). The mass density or density of a material is defined as its mass per unit volume. The symbol most often used for density is ρ (the Greek letter rho). In some cases… …   Wikipedia