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Engineering ToolBox > Air Properties - Imperial Units
Some thermodynamic properties of air at low pressures can be found in the table below:
| Temperature - T - | Enthalpy - h - (Btu/lbm) | Relative Pressure pr | Internal Energy - u - (Btu/lbm) | Specific Volume - vr - | |
| (R) | (oF) | ||||
| 100 | -360 | 23.7 | 0.0038 | 16.9 | 9640 |
| 200 | -260 | 47.7 | 0.0432 | 34.0 | 1715 |
| 300 | -160 | 71.6 | 0.1780 | 51.0 | 624 |
| 400 | -60 | 95.5 | 0.486 | 68.1 | 305 |
| 500 | 40 | 119.5 | 1.059 | 85.2 | 175 |
| 600 | 140 | 143.5 | 2.00 | 102 | 111 |
| 700 | 240 | 167.6 | 3.45 | 120 | 75 |
| 800 | 340 | 191.8 | 5.53 | 137 | 54 |
| 900 | 440 | 216.3 | 8.41 | 155 | 40 |
| 1000 | 540 | 241.0 | 12.3 | 172 | 30.1 |
| 1200 | 740 | 291.3 | 24.0 | 209 | 18.5 |
| 1400 | 940 | 342.9 | 42.9 | 247 | 12.1 |
| 1600 | 1140 | 395.7 | 71.7 | 286 | 8.26 |
| 1800 | 1340 | 449.7 | 114 | 326 | 5.85 |
| 2000 | 1540 | 504.7 | 174 | 368 | 4.26 |
| 2500 | 2040 | 645.8 | 436 | 475 | 2.12 |
| 3000 | 2540 | 790.7 | 941 | 585 | 1.18 |
