# What is density?

Oct 11, 2014

Density is the mass per unit of volume of a substance. It is calculated using the formula $\text{density}$ = $\text{mass"/"volume}$. Mass units include some form of grams, such as kilograms, grams, milligrams. Volume units may be in liters, milileters, cubic centimeters (${\text{cm}}^{3}$).

If a substance has a mass of $\text{62.3g}$ and a volume of ${\text{85.6cm}}^{3}$, you would calculate its density as
$\text{density}$ = $\text{mass"/"volume}$ = ${\text{62.3g"/"85.6cm}}^{3}$ = ${\text{0.728g/cm}}^{3}$

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 ${\text{g/cm}}^{3}$, $\text{g/mL}$, $\text{g/L}$, and ${\text{kg/m}}^{3}$.

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.