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Dortmund Data Bank Thermophysical Data for Process Design Contact: ☎ +49 441 361819 0 or ✉ info@ddbst.com

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DDB#	Name	CAS-RN	Formula
1051	Methane	74-82-8	CH4	Overview

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Pure Component Data

Property	Points	Sets	Temperature Range	States	Sets
Compressibility Factor (isothermal)	228	3	324-425 K	Gas/Vapor	3
Critical Data	34	34	(hidden)	Critical Point	34
Density	8351	362	20-773 K	Supercritical	131
				Gas/Vapor	96
				Liquid	94
				Liquid Phase of VLE	23
				Further States	18
Dielectric Constant	492	26	80-373 K	Gas/Vapor	15
				Liquid	9
				Further States	2
Diffusion Coefficient	5	1	90-353 K	Gas/Vapor	1
Enthalpy	42	6	110-255 K	Supercritical	3
				Liquid	3
Enthalpy (H-H0)	5	1	300-500 K	Gas/Vapor	1
Enthalpy (H-H298)	14	1	0-1500 K	Ideal Gas	1
Entropy	12	8	298-500 K	Gas/Vapor	8
Freezing Point (Supercooled Liq. to Crystal/Solid)	1	1	90-90 K	Solid-Liquid	1
G-function	84	3	60-5000 K	Gas/Vapor	3
Heat of Fusion	7	7	(hidden)	Solid-Liquid	6
				Solid-Liquid-Vapor	1
Heat of Transition	3	3	20-20 K	Crystal 2 > Crystal 1	2
				Solid-Solid	1
Heat of Vaporization	55	10	100-189 K	Vapor-Liquid	10
Ideal Gas Heat Capacity	127	9	60-5000 K	Ideal Gas	9
Joule-Thompson Coefficient (isenthalpic dT/dP)	165	10	250-589 K	Gas/Vapor	10
Melting Point	47	31	(hidden)	Solid-Liquid	28
				Solid-Liquid-Vapor	3
Molar Heat Capacity (cP)	1067	101	2-773 K	Supercritical	27
				Gas/Vapor	27
				Liquid	26
				Solid	20
				Further States	1
Molar Heat Capacity (cV)	600	357	91-297 K	Gas/Vapor	278
				Liquid	67
				Further States	12
Second Virial Coefficient	163	39	90-885 K	Gas/Vapor	38
				Further States	1
Speed of Sound	1637	106	91-473 K	Gas/Vapor	51
				Liquid	24
				Supercritical	17
				Superheated Liquid	10
				Further States	4
Std. Heat of Combustion	2	2	298-298 K	Gas/Vapor	2
Std. Heat of Formation	19	6	0-1500 K	Gas/Vapor	6
Surface Tension	160	16	91-189 K	Liquid	10
				Liquid Phase of VLE	5
				Vapor-Liquid	1
Thermal Conductivity	3505	288	22-973 K	Gas/Vapor	177
				Liquid	61
				Supercritical	49
				Further States	1
Transition Temperature	1	1	(hidden)	Solid-Solid	1
Triple Point	13	13	(hidden)	Solid-Liquid-Vapor	13
Vapor Pressure	1116	115	48-191 K	Vapor-Liquid	110
				Further States	5
Viscosity (Dynamic)	3051	277	78-1050 K	Gas/Vapor	186
				Supercritical	48
				Liquid	38
				Further States	5
Viscosity (Kinematic)	8	1	91-114 K	Liquid	1
Octanol-Water Partition Coefficients	6	6	278-323 K
Mixture P-v-T Data	47	1	298-348 K	n.a.	n.a.
Mixture Surface Tension	8	1	174-185 K	n.a.	n.a.
Mixture Flash Points	1	1	808-808 K	n.a.	n.a.
Mixture Viscosities	81	1	175-333 K	n.a.	n.a.

Pure Component Properties Data Bank Information Page
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