`{:(underset(polar)(H_(2)O), gt, CO_(2), gt, Ar):}`
For non polar molecules: Greater the size or surface area, greater will be vander waals for greater will be 'a' constant.
`|{:(Gas, "a liters"^(2) "atm mole"^(-2), "b liters mole"^(-1)),(He,0.0341,0.0237),(H_(2),0.244,0.0266),(N_(2),1.39,0.0391),(CO,1.49,0.0399),(Ar,1.35,0.0330),(O_(2),1.36,0.0318),(CH_(4),2.25,0.0318),(CO_(2),3.60,0.0427),(NH_(3),3.0,0.0427),(n-C_(5)H_(12),19.01,0.1460),(CH_(3)OH,9.52,0.0670),(C CI_(4),20.4,0.1383),(C_(6)H_(6),18.0,0.1154),(H_(2)O,5.46,0.0305):}|`