- Energy and power
- As part of the metric system but not an SI unit, calories still have widespread use but are being superceded by the Joule
One Calorie (20°C) is the amount of energy needed to raise the temperature of 1 gram of air-free water from 19.5 to 20.5 °C at atmospheric pressure.
The calorie was initially defined in 1824 by Nicolas ClÃ©ment as a unit of heat. It is a metric unit but its use has been superceeded in the SI units by the Joule
The calorie is widely used for measurements in chemistry
- There are 1,000 gram calories in a Kilgram Calorie