1(Of a reaction or process) accompanied by the release of heat. The opposite of endothermic (sense 1).
- Sodium hydroxide dissolved into water is an exothermic process, ammonium nitrate dissolved in water is an endothermic process.
- The rusting of iron is an exothermic reaction and this process is used in hand warmers which are utilized in cold regions.
- When fireworks are ignited, the chemical compounds react with each other in an exothermic reaction - releasing energy.
- Example sentences
- This is because fluorine generally reacts exothermically to form products with stable C-F bonds.
Late 19th century: from French exothermique.
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