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Contrary to the classical equipartition theorem, at room temperature, the vibrational motion of molecules typically makes negligible contributions to the heat capacity. This is because these degrees of freedom are frozen because the spacing between the energy eigenvalues exceeds the energy corresponding to ambient temperatures (). In the following table such degrees of freedom are disregarded because of their low effect on total energy. Then only the translational and rotational degrees of freedom contribute, in equal amounts, to the heat capacity ratio.  This is why =}} for monatomic gases and =}} for diatomic gases at room temperature.

Contrary to the classical equipartition theorem, at room temperature, the vibrational motion of molecules typically makes negligible contributions to the heat capacity. This is because these degrees of freedom are frozen because the spacing between the energy eigenvalues exceeds the energy corresponding to ambient temperatures (). In the following table such degrees of freedom are disregarded because of their low effect on total energy. Then only the translational and rotational degrees of freedom contribute, in equal amounts, to the heat capacity ratio.  This is why =}} for monatomic gases and =}} for diatomic gases at room temperature.

与经典的'''<font color="#ff8000"> 能量均分定理Equipartition theorem</font>'''相反，在室温下，分子的振动对'''<font color="#ff8000"> 热容量Heat capacity</font>'''的贡献通常可忽略不计。这是因为这些自由度被冻结了，因为能量本征值之间的间隔超过了与环境温度（kBT）相对应的能量。在下表中，这些自由度均被忽略，因为它们对总能量的影响非常小。只有平移和旋转自由度对'''<font color="#ff8000"> 热容比Heat capacity ratio</font>'''有些许贡献（等量）。这就是为什么在室温下，单原子气体{{mvar|γ}}={{math|{{sfrac|5|3}}}}和双原子气体{{mvar|γ}}={{math|{{sfrac|7|5}}}}的原因。

与经典的'''<font color="#ff8000"> 能量均分定理Equipartition theorem</font>'''相反，在室温下，分子的振动对'''<font color="#ff8000"> 热容量Heat capacity</font>'''的贡献通常可忽略不计。这是因为这些自由度被冻结了，因为能量本征值之间的间隔超过了与环境温度（kBT）相对应的能量。在下表中，这些自由度均被忽略，因为它们对总能量的影响非常小。只有平移和旋转自由度对'''<font color="#ff8000"> 热容比Heat capacity ratio</font>'''有些许贡献（等量）。这就是为什么在室温下，单原子气体 γ=5/3和双原子气体 γ=7/5的原因。