Exothermic and endothermic reactions
Some chemical reactions release thermal energy as they happen, called exothermic, like the reaction inside a hand warmer; others absorb thermal energy from their surroundings, called endothermic, like the reaction inside an instant cold pack. Engineers pick a reaction with the right one of these two properties to build a device for a specific heating or cooling job, then test the device and modify it, for example by changing the amount of a chemical, until it gets as hot or as cold as needed, for as long as needed.
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