Very often we refer to standard air, for tests results, for fans selection, for design of plants and for many other scopes.
Here, I will only to reports the standar air parameters for a quickly consultation.
| Description | International System of Units | Imperial Units |
| Density | 1.2 kg/m3 | 0.075 lbm/ft3 |
| Ratio of specific heats | 1.4 | 1.4 |
| Viscosity | 0.0018185 Pa*s | 0.00001222 lbm/ft-s |
| Temperature | 20°C | 68°F |
| Relative humidity | 50% | 50% |
| Barometric Pressure | 101325 Pa | 29.92 in.Hg |
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