Etymology:
Meaning and Origin:
A kilocalorie (kcal) is a unit of energy in the metric system. It is equal to 1,000 calories (cal). The calorie, which is the smaller unit, was originally defined as the amount of heat required to raise the temperature of one gram of pure water by one degree Celsius under standard atmospheric pressure.
The kilocalorie was introduced in the early 20th century as a more convenient unit for expressing energy values in food. It is commonly used to measure the energy content of food and energy expenditure in the body.
Conversion to Joules:
1 kilocalorie (kcal) is equal to 4.184 kilojoules (kJ):
1 kcal = 4.184 kJ
Usage:
The kilocalorie is still widely used in many countries, but it is gradually being replaced by the joule (J) as the preferred unit of energy in the International System of Units (SI).
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