The ITS (International Temperature Scale) uses 17 temperature reference points:
Element
Symbol
Type
K
°C
Helium
He
Vapour pressure
5
-268.15
Hydrogen
H2
Triple point
13.8033
-259.3467
Hydrogen
H2
Vapour pressure
17
-256.15
Hydrogen
H2
Vapour pressure
20.3
-252.85
Neon
Ne
Triple point
24.5561
-248.5939
Oxygen
O2
Triple point
54.3584
-218.7916
Argon
Ar
Triple point
83.8058
-189.3442
Mercury
Hg
Triple point
234.315
-38.8344
Water
H2O
Triple point
273.16
0.01
Gallium
Ga
Melting
302.9146
29.7646
Indium
In
Freezing
429.7485
156.5985
Tin
Sn
Freezing
505.078
231.928
Zinc
Zn
Freezing
692.677
419.527
Aluminium
Al
Solidification
933.473
660.323
Silver
Ag
Freezing
1234.93
961.78
Gold
Au
Freezing
1337.33
1064.18
Copper
Cu
Freezing
1357.77
1084.62
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