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Air

Density:
1.293kg/m3
Pressure:
1 standard atmosphere = 14.696 p.s.i. = 29.92 in mercury = 1.013 Bar = 1.013x105 N/m2
Composition:
Substance % by Volume
Nitrogen (N2) 78
Oxygen (O2) 21
Argon (Ar) 0.93
Carbon Dioxide (CO2) 0.03
Neon (Ne) 0.0018
Helium (He) 0.0005

There are a number of other gases in even smaller percentages such as Methane, Hydrogen, .....
Boiling Point:
83K (-190C)
Speed of Sound in Air
343m/s
At standard atmospheric temperature and pressure.