Explain specific gravity

Answer 1

Water is used as the base reference, and it has a value of 1. Anything less dense than water is expressed in numbers smaller than 1 (.71) for example. Anything denser than water is expressed in numbers greater than 1 (2.7).

Answer 2

Specific gravity is a ratio that compares the density of a substance to the density of a reference substance, usually water. It's a measure of how dense a material is compared to water, which has a specific gravity of 1. A higher specific gravity means the material is denser than water, while a lower specific gravity means it's less dense.