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 = 0^oC = 32^oF = 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 = 15^oC = 288.15 K = 59^oF