占士焦耳(英文:James Prescott Joule,1818年12月24號—1889年10月11號)係英國物理學家,發現熱量同做功之間嘅轉換關係,所以研究到能量守恆定律同熱力學第一定律。能量國際單位「焦耳」就係用佢個名。
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