Chemical Reactions

Kinetics and Thermodynamics

What is a calorie?

A calorie is a unit of heat energy defined as the amount of energy it takes to raise one gram of water by one degree Celsius. Calories are also often used to describe the energy content of foods. When used for foods, a “calorie” actually refers to 1,000 calories, or a kilocalorie of energy (which can be rather confusing).


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