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The Calorie, the Joule

Canadian Journals of Research, National Research Council of Canada, Ottawa, Canada K1A OR6

The joule is the unit for all forms of energy in le Système international d'unités, a coherent system founded on seven basic units of the metric system. In nutrition we consider energy manifested in three different ways, as heat, as static work, and as mechanical work; and we also must consider the potential energy of food. A calorie is the specific heat of water. Dissatisfaction with the use of this unit in calorimetry has been expressed among physical scientists. To be useful in kinetics, energy is expressed in terms of the joule. There is more reason to support the use of the joule as the unit of energy in nutrition.

KEY WORDS: • joule • calorie • energy