You can't measure heat directly, so you measure temperature change and work backwards. The calibration factor tells you how much energy this specific calorimeter needs to raise its temperature by one degree. This is the real knowscape from knowhere, not a picture of one. Drag it. Watch what actually changes.
Every reaction either gives energy up or costs you some, and chemistry is mostly the accounting. Put a number on that trade and fuels stop being a list.
A calorimeter absorbs some of the heat released by a reaction, so you multiply the temperature rise by the calibration factor to find how much energy the calorimeter itself absorbed.
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