The density of air is $1.3 kgm^{-3}$. Find the mass of air in a room measuring $8m \times 5m \times 4m$. (208 kg)
Difficulty: Easy
Solution:
Density of air = \rho = $1.3 kgm^{-3}$
Volume of room = v = $8 m \times 5 m \times 4$ m = $160 m^{3}$
Mass of air = m =?
Mass of air = $Density \: of \: air \times \: volume \: of \: room$
Mass of air = $1.3\times 160$
Mass of air = 208 kg
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