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 to , multiply by 100.
To convert from to , divide by 10.
To convert from to , divide by 1000.

  a (L2bar/mol2) 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 3.640 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
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