A kilocalorie (kcal) is a unit of energy equal to 1,000 calories, commonly used to measure the energy content in food and the amount of energy expended through physical activity. In physics, it is often used to quantify heat transfer.
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The amount of heat required to raise the temperature of one gram of a substance by one degree Celsius.
British Thermal Unit (BTU): A unit of heat; it is defined as the amount of heat required to raise the temperature of one pound of water by one degree Fahrenheit.