The terminology of that branch of science concerned with temperature has always been in a most unsatisfactory state. Concepts which are essentially different in kind, such as those of thermodynamic temperature and scales of temperature, are still universally described in identical terms, and completely different quantities continue to share the same symbol. This unscientific state of affairs should not be allowed to persist. The rational treatment of the subject set out in this paper endeavours to remove these existing confusions and ambiguities.
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