Question

what is specific gravity?

Answer 1

Specific Gravity is another term used for relative density : the ratio of the density of an object to a standard density -- particularly water.

Answer 2

Gravity, also called gravitation, in mechanics, the universal force of attraction acting between all matter. ... On Earth all bodies have a weight, or downward force of gravity, proportional to their mass, which Earth's mass exerts on them. Gravity is measured by the acceleration that it gives to freely falling objects.