Melting Points and Heat of Fusion

Substance	Melting point K	Melting point °C	Heat of fusion (10³ J/kg)
Helium	3.5	-269.65	5.23
Hydrogen	13.84	-259.31	58.6
Nitrogen	63.18	-209.97	25.5
Oxygen	54.36	-218.79	13.8
Ethyl alcohol	159	-114	104.2
Mercury	234	-39	11.8
Water	273.15	0.00	334
Sulfur	392	119	38.1
Lead	600.5	327.3	24.5
Antimony	903.65	630.50	165
Silver	1233.95	960.80	88.3
Gold	1336.15	1063.00	64.5
Copper	1356	1083	134

*From Young, Hugh D., University Physics, 7th Ed. Table 15-4.

Discussion of heat of fusion

Boiling Points and Heat of Vaporization

Substance	Boiling point K	Boiling point °C	Heat of vaporization (10³ J/kg)
Helium	4.216	-268.93	20.9
Hydrogen	20.26	-252.89	452
Nitrogen	77.34	-195.81	201
Oxygen	90.18	-182.97	213
Ethyl alcohol	351	78	854
Mercury	630	357	272
Water	373.15	100.00	2256
Sulfur	717.75	444.60	326
Lead	2023	1750	871
Antimony	1713	1440	561
Silver	2466	2193	2336
Gold	2933	2660	1578
Copper	2840	2567	5069

*From Young, Hugh D., University Physics, 7th Ed. Table 15-4.

Discussion of heat of vaporization

Temperature Standard Points

Substance	State	Temperature K
Hydrogen	Triple point	13.81
Hydrogen	Boiling point	20.28
Neon	Boiling point	27.102
Oxygen	Triple point	54.361
Argon	Triple point	83.798
Oxygen	Boiling point	90.188
Water	Triple point	273.16
Water	Boiling point	373.125
Tin	Melting point	505.074
Zinc	Melting point	692.664
Silver	Melting point	1235.08
Gold	Melting point	1337.58

Primary fixed points in the international temperature scale.

From Halliday and Resnick

Discussion of standard temperatures

Triple Point Data

Substance	Temperature K	Pressure 10⁵Pa
Helium-4 (l-point)	2.17	0.0507
Hydrogen	13.84	0.0704
Deuterium	18.63	0.171
Neon	24.57	0.432
Oxygen	54.36	0.00152
Nitrogen	63.18	0.125
Ammonia	195.40	0.0607
Sulfur dioxide	197.68	0.00167
Carbon dioxide	216.55	5.17
Water	273.16	0.00610

From Young, University Physics, 8th Ed., Table 16-3

Discussion of standard temperatures

Triple-state on PvT surface