1. Calculating density when mass and volume are given:

You have a rock with a volume of 15cm3 and a mass of 45 g. What is its density?

solution:

= mV =45/15 = 3.0 g/cm3

2. Calculating volume when mass and density are given:

If you find a shiny rock, a carbon allotrope with a volume of 0.042 cm3 and a mass of 0.14 g, is it graphite or diamond? The density of graphite is 2.266 g/cm3 and the density of diamond is 3.51g/cm3.

 3.Calculating volume when mass and density is given

Consider  a metal cube with a mass of 500 grams and a density  of 2.5 g/ cm³, you can use the formula to find the volume: 

                                                    V = 500 g / 2.5 cm³  = 200 cm³ 

This means the metal has a volume of 200  cubic centimetre.