Air mass

What is the weight of the air in a classroom with dimensions 10 m × 10 m × 2.7 m ? The air density is 1.293 kg/m³.

Correct result:

m =  349.1 kg

Solution:

$$\begin{gathered} V=10\cdot 10\cdot 2.7=270{\text{m}}^3 \\ h=1.293{\text{kg/m}}^3 \\ m=h\cdot V=1.293\cdot 270=349.1\text{ kg} \end{gathered}$$

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