Answer Posted / hermann

1Nm3 (normal m3) of air is a volume of 1m3 of air under
normal conditions of pressure (1 atm = 101.330 kPa) and
temperature (0 deg C = 273 K) (Europe);

Since air can be assumed to behave as an ideal gas under
those conditions, its compressibility factor is 1; so in
the relation:PV=ZmRT; Z=1;R for air= 0.287 kPa.m3/(kg.K);
V=1m3; therefore 101.330*1=1*m*0.287*273; so m = 1.295 kg.

Conversion factor: 1 Nm3/hr = 1.295 kg/hr

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