Methane (R50) Thermodynamic properties

Saturation tables by temperature and by pressure, superheated vapor table, p–h and T–s diagrams and constants of Methane (CH₄), computed with CoolProp. Any other state of Methane, from any two properties, in the State Explorer or the Worksheet.

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Constants

Formula: CH₄
Also known as: CH4, methane, METHANE, R50, n-C1H4
CAS: 74-82-8
Molar mass: 16.043 g/mol
Normal boiling point (1 atm): -161.48 °C (111.67 K)
Critical temperature: -82.586 °C (190.56 K)
Critical pressure: 4.5992 MPa
Critical density: 162.66 kg/m³
Triple point: -182.46 °C, 11.696 kPa
Acentric factor: 0.01142
Valid up to: 351.85 °C, 1000 MPa

Saturation table

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

Saturated Methane, 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)
-180	15.901	0.0022312	3.0071	-63.532	540.75	477.22	-0.61987	5.1853
-170	47.229	0.0023014	1.1081	-29.485	525.47	495.99	-0.27345	4.8208
-160	114.29	0.0023799	0.49291	5.1885	508.09	513.28	0.045884	4.5363
-150	237.84	0.002469	0.25077	40.694	487.9	528.6	0.34399	4.3058
-140	441.77	0.0025721	0.14054	77.299	464.08	541.38	0.62571	4.1111
-130	752.01	0.0026946	0.0844	115.39	435.58	550.97	0.8956	3.9384
-120	1195.9	0.0028455	0.053154	155.58	400.85	556.43	1.1586	3.776
-110	1802.6	0.0030418	0.034416	198.85	357.43	556.28	1.4209	3.6117
-100	2604	0.0033225	0.022363	247.25	300.31	547.56	1.6935	3.4278
-90	3639.9	0.0038217	0.013837	306.71	214.81	521.52	2.0062	3.1791

Saturation table by pressure

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

Saturated Methane, 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)
20	-178.07	0.0022442	2.436	-57.001	537.94	480.94	-0.55057	5.1072
30	-174.44	0.0022693	1.6795	-44.661	532.47	487.81	-0.42344	4.9708
50	-169.41	0.0023058	1.0517	-27.465	524.52	497.05	-0.25399	4.8022
100	-161.64	0.0023664	0.55722	-0.55734	511.12	510.56	-0.0049665	4.5788
200	-152.53	0.0024453	0.29441	31.626	493.31	524.94	0.27035	4.3601
300	-146.44	0.0025039	0.20208	53.598	479.88	533.48	0.44605	4.2331
500	-137.8	0.0025972	0.12497	85.54	458.26	543.8	0.68597	4.0716
1000	-124.01	0.0027807	0.063702	139.16	415.66	554.81	1.0536	3.8406
2000	-107.28	0.0031072	0.030634	211.39	343.56	554.95	1.4934	3.5646
3000	-95.876	0.0034852	0.01856	269.74	270.19	539.93	1.8141	3.3383

Diagrams

p–h diagram of Methane, with isotherms

T–s diagram of Methane, with isobars

Superheated vapor table

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

Superheated Methane at 50 kPa (Tsat -169.41 °C)
T °C	v m³/kg	u kJ/kg	h kJ/kg	s kJ/(kg·K)
Sat.	1.0517	444.46	497.05	4.8022
-160	1.1533	459.61	517.27	4.9888
-140	1.366	491.33	559.62	5.3335
-120	1.5766	522.79	601.62	5.6273
-100	1.7861	554.17	643.48	5.8843
-80	1.9951	585.58	685.34	6.113
-60	2.2036	617.14	727.32	6.3198
-40	2.4119	648.96	769.55	6.5092
-20	2.62	681.19	812.19	6.6847
0	2.828	714	855.4	6.8489

Superheated Methane at 100 kPa (Tsat -161.64 °C)
T °C	v m³/kg	u kJ/kg	h kJ/kg	s kJ/(kg·K)
Sat.	0.55722	454.84	510.56	4.5788
-140	0.67571	489.95	557.52	4.9638
-120	0.78277	521.76	600.03	5.2613
-100	0.88872	553.35	642.22	5.5202
-80	0.99403	584.9	684.3	5.7502
-60	1.0989	616.55	726.45	5.9579
-40	1.2036	648.45	768.81	6.1478
-20	1.308	680.74	811.55	6.3237
0	1.4123	713.6	854.83	6.4882

Superheated Methane at 200 kPa (Tsat -152.53 °C)
T °C	v m³/kg	u kJ/kg	h kJ/kg	s kJ/(kg·K)
Sat.	0.29441	466.06	524.94	4.3601
-140	0.33033	487.08	553.14	4.5826
-120	0.38576	519.64	596.79	4.8881
-100	0.43995	551.67	639.66	5.1513
-80	0.49347	583.51	682.21	5.3838
-60	0.54657	615.37	724.69	5.5931
-40	0.59939	647.42	767.3	5.7842
-20	0.65201	679.84	810.24	5.9609
0	0.70449	712.8	853.69	6.126

Superheated Methane at 500 kPa (Tsat -137.8 °C)
T °C	v m³/kg	u kJ/kg	h kJ/kg	s kJ/(kg·K)
Sat.	0.12497	481.31	543.8	4.0716
-120	0.14715	512.81	586.39	4.3675
-100	0.17052	546.42	631.68	4.6456
-80	0.19306	579.24	675.76	4.8866
-60	0.21511	611.77	719.32	5.1012
-40	0.23686	644.31	762.74	5.2959
-20	0.2584	677.1	806.31	5.4751
0	0.2798	710.36	850.25	5.6422

Superheated Methane at 1 MPa (Tsat -124.01 °C)
T °C	v m³/kg	u kJ/kg	h kJ/kg	s kJ/(kg·K)
Sat.	0.063702	491.11	554.81	3.8406
-120	0.066726	499.32	566.05	3.9149
-100	0.080351	536.77	617.12	4.2287
-80	0.092754	571.66	664.42	4.4874
-60	0.10455	605.51	710.06	4.7123
-40	0.11599	638.97	754.96	4.9136
-20	0.12719	672.45	799.64	5.0975
0	0.13823	706.24	844.47	5.2679

Superheated Methane at 2 MPa (Tsat -107.28 °C)
T °C	v m³/kg	u kJ/kg	h kJ/kg	s kJ/(kg·K)
Sat.	0.030634	493.68	554.95	3.5646
-100	0.034226	512.21	580.67	3.7165
-80	0.04222	554.36	638.8	4.0347
-60	0.049107	591.91	690.12	4.2877
-40	0.055483	627.69	738.66	4.5054
-20	0.061562	662.78	785.91	4.6999
0	0.067449	697.77	832.66	4.8777

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