In a manner that releases heat; by means of an exothermal process or reaction.
From exothermal + the adverb suffix -ly. This adverb modifies verbs and adjectives to describe actions or qualities in an exothermal way.
When explosives detonate exothermally, they release decades-worth of energy in milliseconds—it's why a tiny spark can set off a chain reaction that destroys entire buildings!
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