The Heat of vaporization is the heat required to vaporize one mass unit (one gram) of a substance at its normal boiling point. The vaporization heat of water is 600 Calories per gram. Heat of vaporization is equal and opposite to its heat of condensation, any particular substance has a specific heat of condensation.

Heats of vaporization of the elements

ElementHeat of vaporization (kJ/mol)
Actiniumn/a
Aluminium293.4
Antimony77.14
Argon6.447
Arsenic34.76
Astatine114
Barium142
Beryllium292.40
Bismuth104.8
Boron489.7
Bromine15.438
Cadmium100
Caesium67.74
Calcium153.6
Carbon355.8
Cerium414
Chlorine10.2
Chromium344.3
Cobalt376.5
Copper300.3
Fluorine3.2698
Gallium258.7
Germanium330.9
Gold334.4
Hafnium575
Helium0.0845
ElementHeat of vaporization (kJ/mol)
Hydrogen0.44936
Indium231.5
Iodine20.752
Iridium604
Iron349.6
Krypton9.029
Lanthanum414
Lead177.7
Lithium145.92
Magnesium127.4
Manganese226
Mercury59.229
Molybdenum598
Neon1.7326
Neptuniumn/a
Nickel370.4
Niobium696.6
Nitrogen2.7928
Osmium627.6
Oxygen3.4099
Palladium357
Phosphorus12.129
Platinum510
Polonium60.1
Potassium79.87
Radium37
ElementHeat of vaporization (kJ/mol)
Radon16.4
Rhenium715
Rhodium493
Rubidium72.216
Ruthenium595
Scandium314.2
Selenium26.3
Silicon384.22
Silver250.58
Sodium96.96
Strontium144
Sulfur1.7175
Tantalum743
Technetium660
Tellurium52.55
Thallium164.1
Thorium514.4
Tin295.8
Titanium421
Tungsten824
Vanadium452
Xenon12.636
Yttrium363
Zinc115.3
Zirconium58.2