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^{*}International Steam Table Calorie (1956) (cal_{IT}) equals exactly 4.1868J
^{**}Most widely used BTU definition based on International Steam Table Calorie (1956)
Joule  Energy Unit
Unit of energy in the International System Of Units (SI) is Joule. Joule is the derived unit. Joule formula: 1 J = 1 N · m = 1 kg · m^{2} / s^{2} One joule is the amount of energy required to perform the following actions (source:wikipedia.org)
1 cal = 4.1868J => N calories = N*4.1868 J 1 J = 0.238846 cal => N joules = N*0.238846 calories.

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