Question

If density of a substance is 7800 kg m–3. Find its
(i) density in g cm-3.
(ii) relative density

Answer 1

Density = 7.8 g/cm3

Relative Density = 7.8

Explanation:

(i) 7800 kg m–3 = (7800 * 10^3) / 10^6 g/cm3 = 7800 / 1000 = 7.8 g/cm3

Density = 7.8 g/cm3

(ii) Relative density = Density of substance / density of water.

Density of water in g/cm3 is 1.

So relative density = 7.8 / 1 = 7.8