Calories
Calories are a type of energy unit. The word comes from the French that takes the Latin word calor. Calories have been replaced with SI joule units in most fields, but they are still always used in the context of energy derived from food. There are several definitions of calories in the 19th and 20th centuries. Everything is divided into two classes: ▪ Gram calories is the energy required to raise 1 g of water at 1 ° C. This energy of 4.184 J. ▪ Calorie kilograms are the energy needed to raise the temperature of 1 kg of water by 1 ° C. This energy is 4,184 kJ, and is equal to 1000 calories grams. In the context of science, "calories" usually refer to gram calories, and the symbols of this unit are cal. SI prefix can be used with this unit.