# What must you know about an object before determining its density?

##### 1 Answer
Aug 31, 2016

(i) its mass, and (ii) its volume.

#### Explanation:

Mass is usually easy to measure. Volume may be irregular, and thus more difficult to estimate.

Once given these properties, density ($\rho$) is simply the quotient:

$\rho = \text{Mass"/"Volume}$. For chemists, typically the actual units are $g \cdot c {m}^{-} 3$ or $g \cdot m {L}^{-} 1$.