Question

The dimensions of the room are 4m * 3m * 250cm. When density of air is 1.3kg/m^3. Find the mass of the air in the room.

Answer 1

Explanation:

$volume \: of \: room = volume \: of \: air \\ = 4 \times 3 \times \frac{250}{100} \\ = 30 {m}^{3} \\ \\ density \: of \: air = 1.3kg {m}^{ - 3} \\ density = \frac{mass}{volume } \\ mass = density \times volume \\ = 1.3 \frac{kg}{ {m}^{3} } \times 30 {m}^{2} \\ = 39 kg {m}^{2 - 3} \\ = 39kgm {}^{ - 1}$

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