The polytropic index can be calculated according to the experiment data of coal temperature, the free gas expansion work and adsorbed gas work can be calculated using polytropic index.

 
  • 多变指数可以通过实验测定的煤体温度来计算 ;吸附瓦斯和游离瓦斯的膨胀功可以利用多变指数计算 .
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