A piece of wood of mass 150 g has a volume of 200 cm³. Find the density of wood in

(a) C.G.S. unit

(b) S.I. unit

Mass of wood = 150 g

Volume of wood = 200 cm³

Density of wood = ?

(a) C.G.S. unit of density is g cm^-3.

$\text{Density of Wood}= \dfrac{\text{Mass of Wood}}{\text{Volume of Wood}} \\[1em] = \dfrac{\text{150}}{\text{200}} = 0.75 \text{ g cm}^{-3}$

Density of wood = 0.75 g cm^-3.

(b) S.I. unit of density is kg m^-3.

Density of Wood in kg m^-3 = Density of Wood in g cm^-3 x 1000 = 0.75 x 1000 = 750 kg m^-3

So, Density of Wood = 750 kg m^-3.