Estimate the weight of the air in a 10 m × 12 m × 20 m classroom.
A) 14 kN
B) 29 kN
C) 56 kN
D) 94 kN
B) 29 kN
W = mg = ?Vg = 1.22 kg/m3 x10 x12 x 20 m3 x 9.81 m/s2 = 28 700 N or 28.7 kN
Units: N = kg·m/s2 from F = ma
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