[Answer] What is density?

Answer: Density is the ratio of the mass of a substance to its volume.

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What is density? Number density - Wikipedia Area density - Wikipedia Area density - Wikipedia The density (more precisely the volumetric mass density; also known as specific mass) of a substance is its mass per unit 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. ${\displaystyle \rho ={\frac {m}{V}}}$ 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 ${\displaystyle \rho ={\frac {m}{V}}}$ 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 and iridium are the densest known elements 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 d...

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