(a) What is the difference between the density and relative density of a substance?
(b) If the relative density of a substance is 7.1, what will be its density in SI units?

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Solution

(a)

Density Relative density

i. Mass per unit volume of a substance is called density.
ii. Density = mass/volume
iii. SI unit of density is Kg/m³and CGS unit of density is g/cm³
i. The ratio between the density of a substance and the density of water is called relative density.
ii. Relative density = Density of the substance/density of water at $4^{\circ}$ C
iii. Relative density has no units because it is the ratio between the similar physical quantities (density).

(b) Relative Density = $\frac{D e n s i t y o f o b j e c t}{D e n s i t y o f w a t e r}$

Density of object = Relative Density $\times$ Density of water = 7.1 $\times$ 1000 = 7100 kg/ $m^{3}$

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Density	Relative density
i. Mass per unit volume of a substance is called density. ii. Density = mass/volume iii. SI unit of density is Kg/m³and CGS unit of density is g/cm³	i. The ratio between the density of a substance and the density of water is called relative density. ii. Relative density = Density of the substance/density of water at $4^{\circ}$ C iii. Relative density has no units because it is the ratio between the similar physical quantities (density).