endothermic

An endothermic reaction is one that absorbs or uses heat energy. Just ask a melting snowman about it.

What do green leaves, boiled eggs, and split gas molecules have in common? They have all undergone endothermic reactions, absorbing heat. But just because there’s heat involved doesn’t mean an endothermic reaction is the cause. Its polar — er thermal — opposite, exothermic describes a reaction that makes or gives off heat. It can be easy to confuse the two, but if you can remember that endo means “in” and exo means "out," the heat might not get to you so much.

Definitions of endothermic
  1. adjective
    (of a chemical reaction or compound) occurring or formed with absorption of heat
    synonyms: endothermal, heat-absorbing
    endoergic, energy-absorbing
    (of a nuclear reaction) occurring with absorption of energy
    decalescent
    absorbing heat without increase in temperature when heated beyond a certain point
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    Antonyms:
    exothermal, exothermic, heat-releasing
    (of a chemical reaction or compound) occurring or formed with the liberation of heat
    energy-releasing, exoergic
    (of a nuclear reaction) occurring with evolution or releasing of energy
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