Question

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

Answer 1

(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="Mass"/"Volume"`. For chemists, typically the actual units are `g*cm^-3` or `g*mL^-1`.