Tables on thermodynamics

1 22.1 Characteristic temperatures

1.1 22.1.1 Units and calibration points

22.1/1 Calibration points of temperature scales

Substance		Point	Temperature
Formula	Name		T/K	ϑ/° C
4He	helium-4	λ-point	2.18	−270.97
4He	helium-4	boiling point	4.21	−268.94
p - H2	parahydrogen	triple point	13.81	−259.34
n -H2	hydrogen (normal)	triple point	13.97	−259.18
p - H2	parahydrogen	boiling point	20.27	−252.88
n -H2	hydrogen (normal)	boiling point	20.39	−252.76
Ne	neon	triple point	24.56	−248.59
Ne	neon	boiling point	27.07	−246.08
N2	nitrogen	phase transition	35.5	−237.65
O2	oxygen	phase transition	43.7	−229.79
O2	oxygen	triple point	54.36	−218.79
N2	nitrogen	triple point	63.14	−210.01
N2	nitrogen	boiling point	77.35	−195.80
O2	oxygen	boiling point	90.18	−182.97
C5H12	isopentane	melting point	113.5	−159.65
C7H14	methyl cyclohexane	melting point	146.85	−126.30
C4H10O	diethyl ether	melting point	156.85	−116.30
CS2	carbon disulphide	melting point	161.55	−111.60

1.2 22.1.2 Melting and boiling points

22.1/2...