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Thermodynamic and practical temperature scales
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Summary
The normal hydrogen scale
The International Temperature Scale of 1927
The evolution of ITS-27 and its modifications in 1948
The 1958 4He and 1962 3He vapour pressure scales
The International Practical Temperature Scale of 1968 (IPTS-68)
The 1976 Provisional 0.5 K to 30 K Temperature Scale (EPT-76)
The International Temperature Scale of 1990 (ITS-90)
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Summary


The normal hydrogen scale
The International Temperature Scale of 1927
The evolution of ITS-27 and its modifications in 1948
The 1958 4He and 1962 3He vapour pressure scales
The International Practical Temperature Scale of 1968 (IPTS-68)
The 1976 Provisional 0.5 K to 30 K Temperature Scale (EPT-76)
The International Temperature Scale of 1990 (ITS-90)