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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
1292	Helium	7440-59-7	He	Overview

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Pure Component Data

Property	Points	Sets	Temperature Range	States	Sets
Compressibility Factor (isothermal)	455	16	223-398 K	Gas/Vapor	16
Critical Data	14	14	(hidden)	Critical Point	14
Density	5537	278	0-723 K	Gas/Vapor	116
				Supercritical	75
				Liquid	65
				Further States	22
Dielectric Constant	122	13	2-323 K	Gas/Vapor	7
				Liquid	6
Heat of Vaporization	18	1	2-5 K	Vapor-Liquid	1
Joule-Thompson Coefficient (isenthalpic dT/dP)	7	1	8-20 K	Gas/Vapor	1
Melting Point	80	7	(hidden)	Solid-Liquid	6
				Solid Phase of SLE	1
Molar Heat Capacity (cV)	803	36	1-29 K	Supercritical	12
				Superfluid	9
				Liquid	8
				Solid	4
				Further States	3
Second Virial Coefficient	149	32	14-873 K	Gas/Vapor	31
				Further States	1
Speed of Sound	1074	85	1-473 K	Gas/Vapor	38
				Supercritical	29
				Liquid	17
				Further States	1
Surface Tension	13	2	0-1 K	Liquid	2
Thermal Conductivity	2998	561	0-5000 K	Supercritical	289
				Gas/Vapor	259
				Further States	13
Transition Temperature	16	3	(hidden)	Superfluid > Liquid	2
				Crystal 2 > Crystal 1	1
Vapor Pressure	151	14	1-5 K	Vapor-Liquid	14
Viscosity (Dynamic)	1938	235	1-2150 K	Gas/Vapor	201
				Supercritical	28
				Further States	6
Octanol-Water Partition Coefficients	3	3	297-298 K
Mixture P-v-T Data	123	8	2-423 K	n.a.	n.a.

Pure Component Properties Data Bank Information Page
Why are pure component data in a mixture data bank (MSOS, MTCN, etc.)?

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