## Density

The **mass density** or **density** of a material is its mass per unit volume. The symbol most often used for density is ρ (the lower case Greek letter rho). Mathematically, density is defined as mass divided by volume:

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### Some articles on density:

**Density**Estimation

... In probability and statistics,

**density**estimation is the construction of an estimate, based on observed data, of an unobservable underlying probability

**density**function ... The unobservable

**density**function is thought of as the

**density**according to which a large population is distributed the data are usually thought of as a random sample from that population ... A variety of approaches to

**density**estimation are used, including Parzen windows and a range of data clustering techniques, including vector quantization ...

Spectral

... specific terms which are used are the power spectrum, spectral

**Density**... specific terms which are used are the power spectrum, spectral

**density**, power spectral**density**, or energy spectral**density**...**Density**- Other Common Units

... The SI unit for

**density**is kilograms per cubic metre (kg/m3) Litres and metric tons are not part of the SI, but are acceptable for use with it ... Liquid water has a

**density**of about 1 kg/dm3, making any of these SI units numerically convenient to use as most solids and liquids have densities between 0.1 and 20 kg/dm3 ... tons) per cubic metre (Mg/m3) In US customary units

**density**can be stated in Avoirdupois ounces per cubic inch (oz/cu in) Avoirdupois pounds per cubic inch (lb/cu ...

Boussinesq Approximation (buoyancy)

... It states that

... It states that

**density**differences are sufficiently small to be neglected, except where they appear in terms multiplied by g, the acceleration due to gravity ... the Boussinesq approximation is used since sound waves move via**density**variations ... arises because when considering a flow of, say, warm and cold water of**density**and one needs only consider a single**density**the difference is negligible ...Classification By Schwarzschild Radius - Stellar Black Hole

... If one accumulates matter at nuclear

... If one accumulates matter at nuclear

**density**(the**density**of the nucleus of an atom, about 1018 kg/m3 neutron stars also reach this**density**), such an accumulation would fall within its own ...Related Subjects

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