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Question
Calculate the mass of air in a room of dimensions 4.5 m × 3.5 m × 2.5 m if the density of air at N.T.P. is 1.3 kgm-3 .
Solution
Volume of air = `4.5 xx 3.5 xx 2.5` m3
Density pf air at NTP = 1.3 kgm3
Mass of air = Density × volume
Or Mass = (1.3) × (4.5 × 3.5 × 2.5) = 51.19 kg
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