The dimensions of a hall are 10 m x 7 m x 5 m. If the density of air is 1.11 kg m^-3, find the mass of air in the hall.

The density of aluminium is 2.7 g cm^-3. Express it in kg m^-3.

A piece of zinc of mass 438.6 g has a volume of 86 cm³. Calculate the density of zinc.

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