Dense
Density (volumetric mass density or specific mass) is a substance's mass per unit of volume. The symbol most often used for density is ρ (the lower case Greek letter rho), although the Latin letter D can also be used. Mathematically, density is defined as mass divided by volume:
ρ
=
m
V
,
{\displaystyle \rho ={\frac {m}{V}},}
where ρ is the density, m is the mass, and V is the volume. In some cases (for instance, in the United States oil and gas industry), density is loosely defined as its weight per unit volume, although this is scientifically inaccurate – this quantity is more specifically called specific weight.
For a pure substance the density has the same numerical value as its mass concentration.
Different materials usually have different densities, and density may be relevant to buoyancy, purity and packaging. Osmium is the densest known element at standard conditions for temperature and pressure.
To simplify comparisons of density across different systems of units, it is sometimes replaced by the dimensionless quantity "relative density" or "specific gravity", i.e. the ratio of the density of the material to that of a standard material, usually water. Thus a relative density less than one relative to water means that the substance floats in water.
The density of a material varies with temperature and pressure. This variation is typically small for solids and liquids but much greater for gases. Increasing the pressure on an object decreases the volume of the object and thus increases its density. Increasing the temperature of a substance (with a few exceptions) decreases its density by increasing its volume. In most materials, heating the bottom of a fluid results in convection of the heat from the bottom to the top, due to the decrease in the density of the heated fluid, which causes it to rise relative to denser unheated material.
The reciprocal of the density of a substance is occasionally called its specific volume, a term sometimes 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 mass.
Other conceptually comparable quantities or ratios include specific density, relative density (specific gravity), and specific weight.
Phoenicopter
- 2024-03-29T00:00:00.000000Z
Eyemagination
- 2023-08-31T00:00:00.000000Z
Elixir
- 2023-02-03T00:00:00.000000Z
Rover Ticket
- 2021-11-26T00:00:00.000000Z
Sound Science
- 2020-08-26T00:00:00.000000Z
Wave Soaring
- 2020-04-20T00:00:00.000000Z
Revived Stones
- 2019-10-09T00:00:00.000000Z
Entitas
- 2019-05-02T00:00:00.000000Z
Contact
- 2019-03-15T00:00:00.000000Z
Impact
- 2018-10-04T00:00:00.000000Z
Bellwether
- 2018-03-15T00:00:00.000000Z
Distances
- 2017-07-06T00:00:00.000000Z
Tide Forger
- 2017-04-06T00:00:00.000000Z
Cookies
- 2015-02-09T00:00:00.000000Z
New Speak
- 2014-09-15T00:00:00.000000Z
Exhale
- 2013-07-10T00:00:00.000000Z
December
- 2023-03-29T00:00:00.000000Z
Shelter
- 2022-12-22T00:00:00.000000Z
Similar Artists