Calories (15°C,CIPM, 1950)
Abbreviation/Symbol:
cal15
Unit of:
Energy
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As part of the metric system but not an SI unit, calories still have widespread use but are being superceded by the Joule
Definition:
The International Committee for Weights and Measures have defined one cal15 is the ammount of heat energy needed to raise the temperature of 1g of water from 14.5°C to 15.5°C
Origin:
The calorie was first defined in 1824 by Nicolas Clément as a unit of heat. It is a metric unit who's use has been superceeded in the SI units by the Joule
Usage context:
As part of the metric system but not an SI unit, calories still have widespread use but are being superceded by the Joule