unit:CAL_TH

Type
Description

The energy needed to increase the temperature of a given mass of water by $$1 ^\circ C$$ at atmospheric pressure depends on the starting temperature and is difficult to measure precisely. Accordingly, there have been several definitions of the calorie. The two perhaps most popular definitions used in older literature are the $$15 ^\circ C$$ calorie and the thermochemical calorie.

Properties
$$1 \; cal_{th} = 4.184 J$$ $$\approx 0.003964 BTU$$ $$\approx 1.163 \times 10^{-6} kWh$$ $$\approx 2.611 \times 10^{19} eV$$
cal_{th}
cal_th
Annotations
The energy needed to increase the temperature of a given mass of water by $$1 ^\circ C$$ at atmospheric pressure depends on the starting temperature and is difficult to measure precisely. Accordingly, there have been several definitions of the calorie. The two perhaps most popular definitions used in older literature are the $$15 ^\circ C$$ calorie and the thermochemical calorie.
Thermochemical Calorie(en)

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