[′thər·mē] (thermodynamics) A unit of heat energy equal to the heat energy needed to raise 1 tonne of water from 14.5°C to 15.5°C at a constant pressure of 1 standard atmosphere; equal to 106 fifteen-degrees calories or (4.1855 ± 0.0005) × 106 joules. Abbreviated th.
Thermie
an obsolete unit for a quantity of heat equal to the amount of heat required to heat 1 ton of water from 14.5° to 15.5°C; 1 thermie = 106cal15°.