Temperatures of the standard and primary reference points as adopted for the International Practical Temperature Scale of 1968
Standard
Triple point of water (isotopic composition of ocean water) 273.16K
Primary
Triple point of hydrogen 13.81K
Boiling point of hydrogen at 25/76 atm pressure 17.042K
Boiling point of hydrogen at 1 atm pressure 20.28K
Boiling point of neon at 1 atm pressure 27.102K
Triple point of oxygen 54.361K
Boiling point of oxygen at 1 atm pressure 90.188K
Boiling point of water at 1 atm pressure 373.15K
Melthing point of zinc at 1 atm pressure 692.73K
Melting point of silver at 1 atm pressure 1235.08K
Melting point of gold at 1 atm pressure 1337.58K