What is the density of air in ntp (b) what is the unit of relative density ?
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NTP is defined as air at 20oC (293.15 K, 68oF) and 1 atm (101.325 kN/m2, 101.325 kPa) of pressure. The average density of air at NTP is 1.204 kg/m3 (0.075 pounds per cubic foot)
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