If 200 grams of water is to be heated from 24.0 degrees celsius to 100.0 degrees celsius to make a cup of tea, how much heat must be added?

Conveniently, some scientists have already figured out how much heat energy it takes to increase the temperature of one gram of water by exactly 1 degree Celsius. That is called the specific heat of water and it's value is 4.184J/g.

So simply multiply the specific heat with the number of grams and the number of degrees C like this:

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