Water (R718) Thermodynamic properties

Saturation tables by temperature and by pressure, superheated vapor table, p–h and T–s diagrams and constants of Water (H₂O), computed with CoolProp. Any other state of Water, from any two properties, in the State Explorer or the Worksheet.

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Constants

Formula: H₂O
Also known as: water, WATER, H2O, h2o, R718
CAS: 7732-18-5
Molar mass: 18.015 g/mol
Normal boiling point (1 atm): 99.974 °C (373.12 K)
Critical temperature: 373.95 °C (647.1 K)
Critical pressure: 22.064 MPa
Critical density: 322 kg/m³
Triple point: 0.01 °C, 0.61165 kPa
Acentric factor: 0.34429
Valid up to: 1726.9 °C, 1000 MPa

Saturation table

By temperature: saturated liquid (f) and saturated vapor (g).

Saturated Water, by temperature
T °C	Psat kPa	vf m³/kg	vg m³/kg	hf kJ/kg	hfg kJ/kg	hg kJ/kg	sf kJ/(kg·K)	sg kJ/(kg·K)
25	3.1699	0.001003	43.337	104.83	2441.7	2546.5	0.36723	8.5567
50	12.352	0.0010121	12.027	209.34	2381.9	2591.3	0.70381	8.0748
75	38.595	0.0010258	4.1289	314.03	2320.6	2634.6	1.0158	7.6812
100	101.42	0.0010435	1.6718	419.17	2256.4	2675.6	1.3072	7.3541
125	232.24	0.0010649	0.77002	525.07	2188	2713.1	1.5816	7.077
150	476.17	0.0010905	0.39245	632.18	2113.8	2745.9	1.8418	6.8371
175	892.6	0.0011207	0.21658	741.02	2031.7	2772.7	2.0906	6.6241
200	1554.9	0.0011565	0.12721	852.27	1939.7	2792	2.3305	6.4301
225	2549.7	0.0011994	0.078404	966.8	1835.4	2802.2	2.564	6.2483
250	3976.2	0.0012517	0.050083	1085.8	1715.2	2800.9	2.7935	6.0721
275	5946.4	0.0013175	0.032766	1210.9	1574.3	2785.2	3.0224	5.8944
300	8587.9	0.0014042	0.02166	1345	1404.6	2749.6	3.2552	5.7059
325	12051	0.0015283	0.014183	1493.5	1190.8	2684.3	3.5	5.4909
350	16529	0.00174	0.0088024	1670.9	892.75	2563.6	3.7784	5.211

Saturation table by pressure

By pressure: saturated liquid (f) and saturated vapor (g).

Saturated Water, by pressure
P kPa	Tsat °C	vf m³/kg	vg m³/kg	hf kJ/kg	hfg kJ/kg	hg kJ/kg	sf kJ/(kg·K)	sg kJ/(kg·K)
1	6.97	0.0010001	129.18	29.299	2484.4	2513.7	0.10591	8.9749
2	17.495	0.0010014	66.987	73.428	2459.5	2532.9	0.26056	8.7226
3	24.079	0.0010028	45.653	100.98	2443.9	2544.8	0.35429	8.5764
5	32.874	0.0010053	28.185	137.75	2423	2560.7	0.4762	8.3938
10	45.806	0.0010103	14.67	191.81	2392.1	2583.9	0.6492	8.1488
20	60.058	0.0010172	7.6479	251.42	2357.5	2608.9	0.83202	7.9072
30	69.095	0.0010222	5.2284	289.27	2335.3	2624.6	0.94407	7.7675
50	81.317	0.0010299	3.24	340.54	2304.7	2645.2	1.0912	7.593
100	99.606	0.0010432	1.6939	417.5	2257.4	2675	1.3028	7.3589
200	120.21	0.0010605	0.88568	504.7	2201.5	2706.2	1.5302	7.1269
300	133.52	0.0010732	0.60576	561.43	2163.5	2724.9	1.6717	6.9916
500	151.83	0.0010925	0.37481	640.09	2108	2748.1	1.8604	6.8207
1000	179.88	0.0011272	0.19436	762.52	2014.6	2777.1	2.1381	6.585
2000	212.38	0.0011768	0.099585	908.5	1889.8	2798.3	2.4468	6.339
3000	233.85	0.0012167	0.066664	1008.3	1794.8	2803.2	2.6456	6.1856
5000	263.94	0.0012864	0.039446	1154.6	1639.6	2794.2	2.921	5.9737
10000	311	0.0014526	0.01803	1408.1	1317.4	2725.5	3.3607	5.616
20000	365.75	0.00204	0.0058652	1827.2	585.14	2412.4	4.0156	4.9315

Diagrams

p–h diagram of Water, with isotherms

T–s diagram of Water, with isobars

Superheated vapor table

At each pressure, from its saturated vapor (Sat.) to higher temperatures.

Superheated Water at 200 kPa (Tsat 120.21 °C)
T °C	v m³/kg	u kJ/kg	h kJ/kg	s kJ/(kg·K)
Sat.	0.88568	2529.1	2706.2	7.1269
150	0.95986	2577.1	2769.1	7.281
200	1.0805	2654.6	2870.7	7.5081
250	1.1989	2731.4	2971.2	7.71
300	1.3162	2808.8	3072.1	7.8941
350	1.433	2887.3	3173.9	8.0644
400	1.5493	2967.2	3277	8.2236
450	1.6655	3048.5	3381.6	8.3734
500	1.7814	3131.4	3487.7	8.5152
550	1.8973	3216	3595.4	8.6502
600	2.013	3302.2	3704.8	8.7792
650	2.1287	3390.2	3815.9	8.903

Superheated Water at 500 kPa (Tsat 151.83 °C)
T °C	v m³/kg	u kJ/kg	h kJ/kg	s kJ/(kg·K)
Sat.	0.37481	2560.7	2748.1	6.8207
200	0.42503	2643.3	2855.8	7.061
250	0.47443	2723.8	2961	7.2724
300	0.52261	2803.3	3064.6	7.4614
350	0.57015	2883	3168.1	7.6346
400	0.6173	2963.7	3272.4	7.7955
450	0.66421	3045.6	3377.7	7.9465
500	0.71094	3129	3484.5	8.0892
550	0.75756	3213.9	3592.7	8.2249
600	0.80408	3300.4	3702.5	8.3543
650	0.85055	3388.6	3813.9	8.4784

Superheated Water at 1 MPa (Tsat 179.88 °C)
T °C	v m³/kg	u kJ/kg	h kJ/kg	s kJ/(kg·K)
Sat.	0.19436	2582.8	2777.1	6.585
200	0.20602	2622.2	2828.3	6.6955
250	0.23275	2710.4	2943.1	6.9265
300	0.25799	2793.6	3051.6	7.1246
350	0.2825	2875.7	3158.2	7.3029
400	0.30661	2957.9	3264.5	7.4669
450	0.33045	3040.9	3371.3	7.62
500	0.35411	3125	3479.1	7.7642
550	0.37765	3210.5	3588.1	7.9008
600	0.40111	3297.5	3698.6	8.031
650	0.42449	3386	3810.5	8.1557

Superheated Water at 2 MPa (Tsat 212.38 °C)
T °C	v m³/kg	u kJ/kg	h kJ/kg	s kJ/(kg·K)
Sat.	0.099585	2599.1	2798.3	6.339
250	0.1115	2680.3	2903.2	6.5475
300	0.12551	2773.2	3024.2	6.7684
350	0.1386	2860.5	3137.7	6.9583
400	0.15121	2945.9	3248.3	7.1292
450	0.16354	3031.1	3358.2	7.2866
500	0.17568	3116.9	3468.2	7.4337
550	0.1877	3203.6	3579	7.5725
600	0.19961	3291.5	3690.7	7.7043
650	0.21146	3380.8	3803.8	7.8302

Superheated Water at 5 MPa (Tsat 263.94 °C)
T °C	v m³/kg	u kJ/kg	h kJ/kg	s kJ/(kg·K)
Sat.	0.039446	2597	2794.2	5.9737
300	0.045346	2699	2925.7	6.2111
350	0.051969	2809.5	3069.3	6.4516
400	0.057837	2907.5	3196.7	6.6483
450	0.063323	3000.6	3317.2	6.821
500	0.068583	3091.7	3434.7	6.9781
550	0.073695	3182.4	3550.9	7.1237
600	0.078704	3273.3	3666.8	7.2605
650	0.083639	3365	3783.2	7.3901

Superheated Water at 10 MPa (Tsat 311 °C)
T °C	v m³/kg	u kJ/kg	h kJ/kg	s kJ/(kg·K)
Sat.	0.01803	2545.2	2725.5	5.616
350	0.02244	2699.6	2924	5.9459
400	0.026436	2833.1	3097.5	6.2141
450	0.029782	2944.5	3242.3	6.4219
500	0.032811	3047	3375.1	6.5995
550	0.035654	3145.4	3502	6.7585
600	0.038378	3242	3625.8	6.9045
650	0.041018	3337.9	3748.1	7.0408

Enthalpy and entropy are measured from Water's own reference state (CoolProp's default). The textbooks' refrigerant tables use ASHRAE's: in the Worksheet, write reference ASHRAE.