How to Measure the Calories in a Candy Bar—With Physics!

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How to Measure the Calories in a Candy Bar—With Physics!
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Step one: Trick or treat. Step two: Get out your bomb calorimeter. (Yes, that is a real thing.)

Flavors of Energy In physics, the concept of energy helps us keep track of different types of interactions. We say energy is “conserved” for all interactions, meaning that if you calculate the total energy before and after something happens, that value will be constant. During these interactions, energy can change from one type to another. I like to think of these types as “flavors” of energy. There's the energy of a moving object, a flavor we call kinetic energy.

A candy bar actually has 200,000 calories, not 200. The metrics on food packages are given in kilocalories, so it's actually one-thousandth of the energy the food contains. To prevent confusion, we sometimes call these 'food calories,' as distinct from “chemistry calories.” Other people capitalize “Calorie” to signify the food version. Now let’s say you wanted to work off the 200,000 calories in this candy bar by doing pull-ups.

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