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. 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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