Water (data Page) - Thermodynamic Properties

Thermodynamic Properties

Phase behavior
Triple point 273.16 K (0.01 °C), 611.73 Pa
Critical point 647 K (374 °C), 22.1 MPa
Std enthalpy change
of fusion, ΔfusHo		 6.01 kJ/mol
Std entropy change
of fusion, ΔfusSo		 22.0 J/(mol·K)
Std enthalpy change
of vaporization, ΔvapHo		 40.68 kJ/mol
Std entropy change
of vaporization, ΔvapSo		 108.9 J/(mol·K)
Std enthalpy change
of sublimation, ΔsubHo		 46.70 kJ/mol
Std entropy change
of sublimation, ΔsubSo		 130.9 J/(mol·K)
Molal freezing point constant −1.858 °C kg/mol
Molal boiling point constant 0.512 °C kg/mol
Solid properties
Std enthalpy change
of formation, ΔfHosolid		 −291.83 kJ/mol
Standard molar entropy,
Sosolid		 41 J/(mol K)
Heat capacity, cp 12.2 J/(mol K) at −200 °C
15.0 J/(mol K) at −180 °C
17.3 J/(mol K) at −160 °C
19.8 J/(mol K) at −140 °C
24.8 J/(mol K) at −100 °C
29.6 J/(mol K) at −60 °C
32.77 J/(mol K) at −38.3 °C
33.84 J/(mol K) at −30.6 °C
35.20 J/(mol K) at −20.8 °C
36.66 J/(mol K) at −11.0 °C
37.19 J/(mol K) at −4.9 °C
37.84 J/(mol K) at −2.2 °C
Liquid properties
Std enthalpy change
of formation, ΔfHoliquid		 −285.83 kJ/mol
Standard molar entropy,
Soliquid		 69.95 J/(mol K)
Heat capacity, cp 75.97 J/(mol K) at 0 °C
75.42 J/(mol K) at 10 °C
75.33 J/(mol K) at 20 °C
75.28 J/(mol K) at 25 °C
75.26 J/(mol K) at 30 °C
75.26 J/(mol K) at 40 °C
75.30 J/(mol K) at 50 °C
75.37 J/(mol K) at 60 °C
75.46 J/(mol K) at 70 °C
75.58 J/(mol K) at 80 °C
75.74 J/(mol K) at 90 °C
75.94 J/(mol K) at 100 °C
Gas properties
Std enthalpy change
of formation, ΔfHogas		 −241.83 kJ/mol
Standard molar entropy,
Sogas		 188.84 J/(mol K)
Heat capacity, cp 36.5 J/(mol K) at 100 °C
36.1 J/(mol K) at 200 °C
36.2 J/(mol K) at 400 °C
37.9 J/(mol K) at 700 °C
41.4 J/(mol K) at 1000 °C
Heat capacity, cv 27.5 J/(mol K) at 100 °C
27.6 J/(mol K) at 200 °C
27.8 J/(mol K) at 400 °C
29.5 J/(mol K) at 700 °C
33.1 J/(mol K) at 1000 °C
Heat capacity ratio,
γ = cp/cv		 1.324 at 100 °C
1.310 at 200 °C
1.301 at 400 °C
1.282 at 700 °C
1.252 at 1000 °C
van der Waals' constants a = 553.6 L2 kPa/mol2
b = 0.03049 liter per mole

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