You are studying (seriously) and suddenly you thought of calculating mass of air enclosed in your room. You found that the length, breadth and height of your room are 5 m, 4 m and 3 m respectively. If the density of air enclosed in your room in 1.2 kg m $^{- 3}$ , what is the mass of air enclosed in your room?

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Solution

Volume = $5 \times 4 \times 3 m^{3} = 60 m^{3}$
density = $1.2 k g m^{- 3}$
So, mass = $d e n s i t y \times v o l u m e$
= 1.2 $\times$ 60 kg = 72 kg

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