Calorie

Calorie One Calorie is equal to one kilocalorie, or 1000 calories. It is also equal to 4.187 kiloJoules per kilocalories. It is used to measure the amount of kilocalories in food, or how much heat is needed to raise the temperature of 1 kilogram of water by 1 degree Celsius ( large, kilogram, or dietary calorie). A small or gram calorie is a unit used to measure the amount of heat needed to raise the temperature of 1 gram of water by 1 degree Celsius. It is equal to 4.186 Joules. The average human needs 2000 Calories to survive everyday life.The calorie is a pre- Si metric unit of energy. It was first defined by Nicolas Clement in 1824 as a unit of heat, entering French and English dictionaries between 1841 and 1867.In most fields its use is archaic, having been replaced by the SI unit of energy, the joule. However, in many countries it remains in common use as a unit of food energy. In an attempt to avoid confusion, the large calorie is sometimes written as //Calorie// (with a capital //C//). This convention, however, is not always followed, and not explained to the average person clearly. Whether the large or small calorie is intended often must be inferred from context. When used in scientific contexts, the term //calorie//refers to the small calorie; it is often encountered in contexts such as bond and conformational energies in molecular modeling. The gram calorie, however, is too small a unit for use in nutritional contexts. Instead, the kilocalorie (symbol: Kcal) or large calorie is used. In this context //calorie// and //kilocalorie// are equivalent.

The gram calorie is too small a unit for use in nutritional contexts. Instead, the large calorie is used. In this context //calorie// and //kilocalorie// are equivalent. In an attempt to avoid confusion, the large calorie is sometimes written as //Calorie// (with a capital //C//). This convention, however, is not always followed, and not explained to the average person clearly (and is sometimes ambiguous, such as at the beginning of a sentence). Whether the large or small calorie is intended often must be inferred from context. When used in scientific contexts, the term //calorie// refers to the small calorie; it is often encountered in contexts such as bond and conformational energies in molecular modelin.
 * The **small calorie** or **gram calorie** (symbol: cal) approximates the energy needed to increase the temperature of 1 gram of water by 1 °C. This is about 4.2 joules.
 * The **large calorie**, **kilogram calorie**, **dietary calorie**, **nutritionist's calorie** or **food calorie** (symbol: Cal) approximates the energy needed to increase the temperature of 1 kilogram of water by 1 °C. This is exactly 1,000 small calories or about 4.2 kilojoules.