焦耳者，所以計能量之大小也。其符號曰J，蓋英語Joule之略稱也。夫功者，力與位移之積也。故焦耳之定義曰：一牛頓之力加於物時，物移一米，則其功一焦耳也。 焦耳之名，出於物理學者詹姆斯焦耳。昔焦耳考熱之性，始知熱功當量之實。故後世以焦耳名之。
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