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| Substance | Critical temperature | Critical pressure absolute lb./sq. in. atm. | Boiling temperature at atmospheric pressure | |||
|---|---|---|---|---|---|---|
| °F | °C | lb./sq, in. | atm | °F | °C | |
| Air | -220 | -140 | 573 | 39 | - | |
| Alcohol (C₂H₅O) | 421 | 216 | 966 | 65 | 172.4 | 78 |
| Ammonia (NH₃) | 266 | 130 | 1691 | 115 | -27.4 | -33 |
| Benzol (C₆H₆) | 554 | 292 | 735 | 50 | 176 | 80 |
| Carbon-dioxide (CO₂) | 88.2 | 31 | 1132 | 77 | -110 | -79 |
| Carbon-monoxide (CO) | -222 | -141 | 528 | 35.9 | -310 | -190 |
| Ether (C₄H₁₀O) | 381.2 | 194 | 544 | 37 | 95 | 35 |
| Hydrogen (H) | -402 | -242 | 294 | 20 | -423 | -253 |
| Nitrogen (N) | -236 | -149 | 514 | 35 | -321 | -195 |
| Oxygen (O₂) | -180 | -118 | 735 | 50 | -297 | -183 |
| Water (H₂O) | 706-716 | 375-380 | 3200 | 217.8 | 212 | 100 |
SOURCE: Data adapted from Mark's Mechanical Engineers' Handbook.