**Density** is defined as the mass of a substance contained per unit volume. In simpler words, density is a characteristic property of matter that defines how heavy or light it is. Heavier substances have greater densities than lighter substances.

__The formula for density is:__

__Note that we need our density value in the units of g/cm__^{3}__. So, we will be following these steps:__

- We will convert our mass (40 lb) to gram units.
- We will convert the container dimensions (14 x 20 x 30 in) to cm units.
- We will find the volume of the container from its dimensions.
- We will use the mass and volume to calculate density.

So, let’s begin.

A 40-lb container of peat moss measures 14 x 20 x 30 in. A 40-lb container of topsoil has a volume of 1.9 gal.

Calculate the average density of peat moss in units of g/cm^{3}.

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What scientific concept do you need to know in order to solve this problem?

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