One Joule is 1 Newton Metre, ie the work done or energy transfered to an object when a one Newton force acts on it over one metre. It can also be defined as the heat energy dissipated by a current of one ampere passing through a one Ohm resistor for one second
Joules to Calories (I.T.) conversion
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The 5th International Conference on the Properties of Steam defined the International Table calorie as 4.1868 J