... Properties] Molecular weight 116.95 Critical pressure, MPa 4.25 Boiling Point (1 atm), 32.05 Critical density, ... of boiling point, KJ / kg 223.0 Density (25), liquid, g/cm3 1.227 thermal conductivity of steam ... 1 atm, 25), mw / mk 8.3 Vapor density (air = 1) 4.1 Solubility in water (25), w% 0.509 ... Vapor pressure (25), MPa 0.079 Specific Heat (25), liquid, KJ / kg 1 ...