Question

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

Answer 1

The dimensions of the hall are $10m\times$ $7m\times$ $5m$
i.e. Volume of the hall = 10 x 7 x 5 = 350 $m^3$

Since air occupies the entire volume of the hall,
Volume of air in the hall = Volume of the hall = 350 $m^3$

Density of air(D) = 1.11 kg $m^{-3}$
Mass = volume $\times$ density

Mass = 350 $\times$ 1.11

= 388.5 kg