The Jacana Technical Library

Air and Gases

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 Physical Properties of Air

 

Density of dry air ay Standard Temperature and Pressure

1.29274 kilograms/cu metre

 

Universal Gas Constant (R): 0.08206 litre atmosphere/mole kelvin

8.31451 joule/mole kelvin

 

Standard Reference Conditions

(also known as Standard Temperature and Pressure - STP)

Standard Temperature = 0oC = 32oF = 273.15K

Standard Pressure = 760 mm Hg =

14.696 pounds-force/sq inch = 2116.22 pounds-force/sq foot =

29.92 inces Hg = 1.01325 x 105 N/m2 = 1.01325 x 105 Pa =

101.325 kPa

 

Speed of sound in dry air at STP:

331.45 metres/sec = 1087.4 ft/sec = 741.4 miles/hr

 

ICAO Sea Level Air Standard Values:

Atmospheric pressure = 760 mm Hg = 14.7 lbs-force/sq inch

Temperature = 15oC = 288.15 K = 59oF

 

 

 

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