Question

What is density?
What is the formula and S.I unit of density?
What is relative density? and its formula?

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Answer 1

maas by volume is the formula

Answer 2

Density is the mass per unit volume. And the unit of density is kg m.
Relative Density is the ratio of the density (mass of a unit volume) of a substance to the density of a given reference material. Specific gravity usually means Relative Density with respect to water.
hope it will help you