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 kg m-3

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Answer

Density of air = 1.3 kg m-3

Dimensions of room = 4.5 m × 3.5 m × 2.5 m

∴ Volume of room = 4.5 × 3.5 × 2.5 = 39.375 m3

Mass = density × volume

= 1.3 × 39.375

= 51.1875 kg

Therefore, mass of body = 51.1875 kg ≈ 51.19 kg

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