“mechanical equivalent of heat”的概念、定义、翻译、参考文献-科学参考

单词	mechanical equivalent of heat
释义	mechanical equivalent of heat Physics Symbol J. The ratio of a unit of mechanical energy to the equivalent unit of thermal energy, when a system of units is used in which they differ. J has the value 4.1868 × 10⁷ ergs per calorie. The concept loses its usefulness in SI units in which all forms of energy are expressed in joules and J therefore has a value of 1.
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