Table 2. Secondary reference points.

Under a pressure of 1 standard atmosphere, except for the triple points.

	Temperature °C (Int. 1948)
Temperature of equilibrium between solid carbon dioxide and its vapor	−78.5
tp=[−78.5 to +12.12(p/po−1)−6.4(p/po−1)2]°C
Temperature of equilibrium between solid mercury and liquid mercury	−38.87
Temperature of equilibrium between ice and air-saturated water	0.000
Temperature of triple point of phenoxybenzene (diphenyl-ether)	26.88
Temperature of transition of sodium sulphate decahydrate	32.38
Temperature of triple point of benzoic acid	122.36
Temperature of equilibrium between solid indium and liquid indium	156.61
Temperature of equilibrium between liquid naphthalene and its vapor	218.0
tp[=218.0+44.4(p/po−1) −19(p/po−1)2]°C
Temperature of equilibrium between solid tin and liquid tin	231.91
Temperature of equilibrium between liquid benzophenone and its vapor	305.9
tp+[305.9+48.8(p/po−1) −21 (p/po−1)2]°C
Temperature of equilibrium between solid cadmium and liquid cadmium	321.03
Temperature of equilibrium between solid lead and liquid lead	327.3
Temperature of equilibrium between liquid mercury and its vapor	356.58
tp = [356.58+55.552(p/po−1) −23.03(p/po−1)2+14.0(p/po−1)3]°C
Temperature of equilibrium between solid aluminum and liquid aluminum	660.1
Temperature of equilibrium between solid copper and liquid copper (in a reducing atmosphere)	1083
Temperature of equilibrium between solid nickel and liquid nickel	1453
Temperature of equilibrium between solid cobalt and liquid cobalt	1492
Temperature of equilibrium between solid palladium and liquid palladium	1552
Temperature of equilibrium between solid platinum and liquid platinum	1769
Temperature of equilibrium between solid rhodium and liquid rhodium	1960
Temperature of equilibrium between solid iridium and liquid iridium	2443
Temperature of melting tungsten	3380