Is éard is fuinneamh cheimiceach ann ná cumas substainte ceimicí chun dul faoi chlaochlú, trí imoibriú ceimiceach nó, chun substaintí ceimiceacha eile a athrú. I measc na samplaí tá cadhnraí, bolgáin solais, agus cealla srl. Bíonn fuinneamh i gceist nuair a dhéantar nó nuair a bhristear naisc cheimiceacha, a fhéadfar a bheith ionsúite nó eascartha ó chóras ceimiceach.
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