本文指出了目前内弹道中普遍使用的定余容Nobel-Abel状态方程的局限性，讨论了将余容作为密度或温度函数，得到了变余容的Nobel-Abel方程。最后，本文还给出了各种不同火药在燃烧以后其余容随密度或温度变化的函数关系。

This paper shows the limitations of the constant covolume Nobel-Abel equation of state extensively used in interior ballistics. The covolume is here considered as a function of density or temperature, and the variable covolume Nobel-Abel equation of state derived. Finally, the covolu- me formulae for a variety of powders (as functions of density or temperature) are given at the end of the paper.