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(a) Define density. What is the SI unit of density?(b) Define relative density. What s the SI unit of relative density?
(a). Density- The mass of a substance per unit volume is the density of the substance.
$Density=\frac{mass}{volume}$
The SI unit of density is $kg/m^3$.
(b). Relative density- The ratio of the density of a substance to the density of water is known as the relative density.
$Relative\ density=\frac{Density\ of\ substance}{density\ of\ water}$
Relative density is a ratio and it is unitless.
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