Define the term 'relative density.' Write its SI unit. If the relative density of a substance is 0.8, is it heavier than or lighter than water?
a) Relative density is the ratio of density of a substance to the density of water. SI unit: No unit. Heavier than water.
b) Relative density is the mass of a substance per unit volume. SI unit: kg/m³. Lighter than water.
c) Relative density is the weight of a substance. SI unit: Newton. Heavier than water.
d) Relative density is the specific gravity of a substance. SI unit: No unit. Lighter than water.
