Question

What is meant by relative density of a substance. What is its significance? The relative density of mercury is 13.6. What does its density in SI unit?(Dw=1000 kg/m-3

Answer 1

Relative density of a substance is the ration between the density of that substance and density of water.

Relative density of mercury=(density of mercury)/(density of water).
=>13.6=(density of mercury)/1000
=>density of mercury=13.6x1000
Density of mercury=13600kg/m-3

(Note:relative density doesn’t have a unit since it is a ratio . So the units will get cancelled)

Relative density tells us how heavy a substance is in comparison with water.
(Hope it is helpful)

Answer 2

the ratio of the density of a substance to the density of a standard, usually water for a liquid or solid, and air for a gas.