Question

if density

Answer 1

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

where ? is the density, m is the mass, and V is the volume.

For a pure substance the density has the same numerical value as its mass concentration.

A graduated cyclinder having liquids with different densities.

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.