Question

b) The relative density of a substance is defined as the __________
density of the substance to the density of water.​

Answer 1

Answer:

ratio.................

Answer 2

Density:

Density of a substance is defined as the mass per unit volume of the substance.

Relative density :

Relative density of a substance is the ratio of its density to that of water.

Hope that my answer being helpful for you ✔️