Van der Waals constants (data page)
The following table lists the Van der Waals constants for a number of common gases and volatile liquids. These constants are generally calculated from the critical pressure and temperature using the formulas and.
To convert from to, multiply by 100.
To convert from to, divide by 10.
To convert from to, divide by 1000.
| Chemical | a | b |
| Acetic acid | 17.7098 | 0.1065 |
| Acetic anhydride | 20.158 | 0.1263 |
| Acetone | 16.02 | 0.1124 |
| Acetonitrile | 17.81 | 0.1168 |
| Acetylene | 4.516 | 0.0522 |
| Ammonia | 4.225 | 0.0371 |
| Aniline | 29.14 | 0.1486 |
| Argon | 1.355 | 0.03201 |
| Benzene | 18.24 | 0.1193 |
| Bromobenzene | 28.94 | 0.1539 |
| Butane | 14.66 | 0.1226 |
| 1-Butanol | 20.94 | 0.1326 |
| 2-Butanone | 19.97 | 0.1326 |
| Carbon dioxide | 3.6 | 0.04267 |
| Carbon disulfide | 11.77 | 0.07685 |
| Carbon monoxide | 1.505 | 0.0398500 |
| Carbon tetrachloride | 19.7483 | 0.1281 |
| Chlorine | 6.579 | 0.05622 |
| Chlorobenzene | 25.77 | 0.1453 |
| Chloroethane | 11.05 | 0.08651 |
| Chloromethane | 7.570 | 0.06483 |
| Cyanogen | 7.769 | 0.06901 |
| Cyclohexane | 23.11 | 0.1424 |
| Cyclopropane | 8.34 | 0.0747 |
| Decane | 52.74 | 0.3043 |
| 1-Decanol | 59.51 | 0.3086 |
| Diethyl ether | 17.61 | 0.1344 |
| Diethyl sulfide | 19.00 | 0.1214 |
| Dimethyl ether | 8.180 | 0.07246 |
| Dimethyl sulfide | 13.04 | 0.09213 |
| Dodecane | 69.38 | 0.3758 |
| 1-Dodecanol | 75.70 | 0.3750 |
| Ethane | 5.562 | 0.0638 |
| Ethanethiol | 11.39 | 0.08098 |
| Ethanol | 12.18 | 0.08407 |
| Ethyl acetate | 20.72 | 0.1412 |
| Ethylamine | 10.74 | 0.08409 |
| Ethylene | 4.612 | 0.0582 |
| Fluorine | 1.171 | 0.0290 |
| Fluorobenzene | 20.19 | 0.1286 |
| Fluoromethane | 4.692 | 0.05264 |
| Freon | 10.78 | 0.0998 |
| Furan | 12.74 | 0.0926 |
| Germanium tetrachloride | 22.90 | 0.1485 |
| Helium | 0.0346 | 0.0238 |
| Heptane | 31.06 | 0.2049 |
| 1-Heptanol | 38.17 | 0.2150 |
| Hexane | 24.71 | 0.1735 |
| 1-Hexanol | 31.79 | 0.1856 |
| Hydrazine | 8.46 | 0.0462 |
| Hydrogen | 0.2476 | 0.02661 |
| Hydrogen bromide | 4.510 | 0.04431 |
| Hydrogen chloride | 3.716 | 0.04081 |
| Hydrogen cyanide | 11.29 | 0.0881 |
| Hydrogen fluoride | 9.565 | 0.0739 |
| Hydrogen iodide | 6.309 | 0.0530 |
| Hydrogen selenide | 5.338 | 0.04637 |
| Hydrogen sulfide | 4.490 | 0.04287 |
| Isobutane | 13.32 | 0.1164 |
| Iodobenzene | 33.52 | 0.1656 |
| Krypton | 2.349 | 0.03978 |
| Mercury | 8.200 | 0.01696 |
| Methane | 2.253 | 0.04278 |
| Methanol | 9.649 | 0.06702 |
| Methylamine | 7.106 | 0.0588 |
| Neon | 0.2135 | 0.01709 |
| Neopentane | 17.17 | 0.1411 |
| Nitric oxide | 1.358 | 0.02789 |
| Nitrogen | 1.370 | 0.0387 |
| Nitrogen dioxide | 5.354 | 0.04424 |
| Nitrogen trifluoride | 3.58 | 0.0545 |
| Nitrous oxide | 3.832 | 0.04415 |
| Octane | 37.88 | 0.2374 |
| 1-Octanol | 44.71 | 0.2442 |
| Oxygen | 1.382 | 0.03186 |
| Ozone | 3.570 | 0.0487 |
| Pentane | 19.26 | 0.146 |
| 1-Pentanol | 25.88 | 0.1568 |
| Phenol | 22.93 | 0.1177 |
| Phosphine | 4.692 | 0.05156 |
| Propane | 8.779 | 0.08445 |
| 1-Propanol | 16.26 | 0.1079 |
| 2-Propanol | 15.82 | 0.1109 |
| Propene | 8.442 | 0.0824 |
| Pyridine | 19.77 | 0.1137 |
| Pyrrole | 18.82 | 0.1049 |
| Radon | 6.601 | 0.06239 |
| Silane | 4.377 | 0.05786 |
| Silicon tetrafluoride | 4.251 | 0.05571 |
| Sulfur dioxide | 6.803 | 0.05636 |
| Sulfur hexafluoride | 7.857 | 0.0879 |
| Tetrachloromethane | 20.01 | 0.1281 |
| Tetrachlorosilane | 20.96 | 0.1470 |
| Tetrafluoroethylene | 6.954 | 0.0809 |
| Tetrafluoromethane | 4.040 | 0.0633 |
| Tetrafluorosilane | 5.259 | 0.0724 |
| Tetrahydrofuran | 16.39 | 0.1082 |
| Tin tetrachloride | 27.27 | 0.1642 |
| Thiophene | 17.21 | 0.1058 |
| Toluene | 24.38 | 0.1463 |
| 1-1-1-Trichloroethane | 20.15 | 0.1317 |
| Trichloromethane | 15.34 | 0.1019 |
| Trifluoromethane | 5.378 | 0.0640 |
| Trimethylamine | 13.37 | 0.1101 |
| Water | 5.536 | 0.03049 |
| Xenon | 4.250 | 0.05105 |
Units
1 J·m3/mol2 = 1 m6·Pa/mol2 = 10 L2·bar/mol21 L2atm/mol2 = 0.101325 J·m3/mol2 = 0.101325 Pa·m6/mol2
1 dm3/mol = 1 L/mol = 1 m3/kmol = 0.001 m3/mol