# Van der Waals constants (data page)

The following table lists the Van der Waals constants (from the Van der Waals equation) for a number of common gases and volatile liquids.
To convert from $\mathrm {L^{2}bar/mol^{2}}$ to $\mathrm {L^{2}kPa/mol^{2}}$, multiply by 100. To convert from $\mathrm {L^{2}bar/mol^{2}}$ to $\mathrm {m^{6}Pa/mol^{2}}$, divide by 10. To convert from $\mathrm {L/mol}$ to $\mathrm {m^{3}/mol}$, divide by 1000.
| | a (L$^2$bar/mol$^2$) | b (L/mol) |
| 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·m$^3$/mol$^2$ = 1 m$^6$·Pa/mol$^2$ = 10 L$^2$·bar/mol$^2$
1 L$^2$atm/mol$^2$ = 0.101325 J·m$^3$/mol$^2$ = 0.101325 Pa·m$^6$/mol$^2$
1 dm$^3$/mol = 1 L/mol = 1 m$^3$/kmol = 0.001 m$^3$/mol (where kmol is kilomoles = 1000 moles)