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sep 28, 1840 - 俄国盖斯发表热化学反应的盖斯定律。英国焦耳发现电热定律，开始精确测定热功当量，实验确立能量守恒定律。德国迈尔第一个发表能量守恒定律。

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1840年俄国盖斯发表热化学反应的盖斯定律。英国焦耳发现电热定律，开始精确测定热功当量，实验确立能量守恒定律。德国迈尔第一个发表能量守恒定律。

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