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If a room has dimensions 3m x 4m x 5m, w...

If a room has dimensions 3m x 4m x 5m, what is the mass of air in the room if density of air at NTP is `1.3kg/m^(3)`

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`m=rhoxxv=(1.3kg//m^(3))(3xx4xx5m^(3))=78 kg`
i.e. ,mass of air in the room is 78 kg which is unbelievable (as air is assumed to be weightless) but is true.
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