The Joule - Thomson coefficient and the transition temperature of nitrogen gas were studied by u-sing the improved Berthelot equation and its Virial form,finding that there is little deviations between its theoreti-cal value and its experimental one,generally reflecting its relations of actual effects.%运用改进的伯塞活脱状态方程结合其Virial形式讨论J-T系数和转换温度，通过对氮气的J-T系数及转换温度与改进伯塞活脱理论值比较发现，氮气J-T系数和转换温度的实验值与理论值偏差不大，基本能反映实际气体J-T效应的基本关系。
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