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Thermochemical Calorie

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.

4.184

4.184E0

0112/2///62720#UAA364

http://en.wikipedia.org/wiki/Calorie

https://cdd.iec.ch/cdd/iec62720/iec62720.nsf/Units/0112-2---62720%23UAA364

$1 \; cal_{th} = 4.184 J$ $\approx 0.003964 BTU$ $\approx 1.163 \times 10^{-6} kWh$ $\approx 2.611 \times 10^{19} eV$

cal

cal_th

D35