- Thermodynamics.
- an amount of heat exactly equal to 4.1840 joules. Abbreviation: cal
- kilocalorie. Abbreviation: Cal
- Physiology.
- a unit equal to the kilocalorie, used to express the heat output of an organism and the fuel or energy value of food.
- a quantity of food capable of producing such an amount of energy.
- a unit of heat, equal to 4.1868 joules (International Table calorie): formerly defined as the quantity of heat required to raise the temperature of 1 gram of water by 1°C under standard conditions. It has now largely been replaced by the joule for scientific purposes
- a unit of heat, equal to one thousand calories, often used to express the heat output of an organism or the energy value of food
- the amount of a specific food capable of producing one thousand calories of energy
