From Glossary of Meteorology
In physics, usually the density of water at the ice point (0°C), 0.99984 g cm-3; or the maximum density of water (at 4°C), 0.99997 g cm-3.
In the U.S. Standard Atmosphere–1976, the density of air at a standard temperature of 15°C and a standard pressure of 1013.25 mb is 1225.00 g cm-3.
Jursa, A. S., Ed. 1985. Handbook of Geophysics and the Space Environment. Air Force Geophysics Laboratory, . p. 14-1.