# What is density?

##### 1 Answer

Density is the mass per unit of volume of a substance. It is calculated using the formula

If a substance has a mass of

There is a device called a density triangle, that can help you remember the density formula, and use it to find mass when density and volume are known; and to find volume when density and mass are known.

Density units are most commonly

If you need to find density, cover the D, and the M over the V means to divide mass by volume. If you need to find mass, cover the M and the D next to the V means to multiply density times volume. If you need to find volume, cover the V and the M over D means to divide the mass by the density.