exothermically
/ˌɛksoʊˈθɜrmɪkli/
adverb
- In a way that releases heat, especially during a chemical reaction.
- The reaction proceeded exothermically, warming the beaker noticeably.
- When the acid mixed with water, it reacted exothermically and the container became hot.
- The fuel burns exothermically, producing both heat and light.