1000 joules is equal to one calorie.
how many joules is equal to one calorie?
1000
in 1878, german nutritionist max rubner crafted what he called the "isodynamic law". the law claims that the basis of nutrition is the exchange of energy, and was applied to the study of obesity in the early 1900s by carl von noorden. von noorden had two theories about what caused people to develop obesity. the first simply avowed rubner's notion that "a calorie is a calorie". the second theorized that obesity development depends on how the body partitions calories for either use or storage. since 1925, a calorie has been defined in terms of the joule. the definition of a calorie changed in 1948, which became one calorie is equal to approximately 4,2 joules.
a calorie is a calorie
using the international system of units, researchers measure energy in joules (j) or in its multiples; the kilojoule (kj) is most often used for food-related quantities. an older metric system unit of energy, still widely used in food-related contexts, is the calorie; more precisely, the "food calorie", "large calorie" or kilocalorie (kcal or cal), equal to 4184 joules. (contrast the "small calorie" (cal), equal to of a food calorie, that is often used in chemistry and in physics.) within the european union, both the kilocalorie ("kcal") and kilojoule ("kj") appear on nutrition labels. in many countries, only one of the units is displayed; in canada and the united states labels spell out the unit as "calorie" or as "calorie".
food energy