What is a calorie?
Chemistry For Your Life
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The Origins of Calories
The answer to what is a calorie is the same question as why is water and sand at the beach different temperatures. The original definition of a calorie was defined most recently in history before its current definition. To raise one gram of water by one degree Celsius, it takes 4.184 Jules (the accepted specific heat of water) "It's just a way of measuring energy"
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