A unit of energy, the heat required to raise the temperature of 1000 kilograms of water 1 degree Celsius, 1,000,000 calories15, approximately 4.1855 × 106 joules. Symbol, th. It was made a legal unit in France in 1919.
In 1971, the European Economic Community directed that use of this unit cease by 31 December 1977.¹
1. European Economic Community, Council Directive of 18 October 1971 on the approximation of the laws of the Member States relating to units of measurement (Directive 71/354/EEC), Annex, Chapter III.
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