Calories (20°C) conversion

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Calories (20°C)


  • cal20

Unit of:

  • Energy and power

Worldwide use:

  • As part of the metric system but not an SI unit, calories still have widespread use but are being superceded by the Joule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 Clément as a unit of heat. It is a metric unit but its use has been superceeded in the SI units by the Joule

Usage context:

The calorie is widely used for measurements in chemistry


  • There are 1,000 gram calories in a Kilgram Calorie