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体积与热容一起同是最基本的热力学参数。前者与压力有关;后者与温度有关。在计算一个热力学系统的平衡条件时(如超镁铁包体—碱性玄武岩浆平衡,斑晶—熔浆平衡,等等),体积资料和热容资料都是不可少的。这一点,从下面的公式中可以看得更清楚: (σlnY/σT)P=某种特征能量(如焓H)/RT~2 (1) (σlnY/σP)T=体积/RT (2)两式中的Y是某种平衡热力学函数,如液相的蒸汽压、反应的平衡常数,等等,R是气体常数,P是压力,T是温度。
Volume and heat capacity together is the most basic thermodynamic parameters. The former is stress related; the latter is temperature dependent. In calculating the equilibrium conditions of a thermodynamic system (eg, ultramafic inclusions - basic basaltic magma equilibria, plaque - magma equilibria, etc.), volumetric and heat capacity data are all essential. This can be seen more clearly from the formula below: (σlnY / σT) P = energy of some characteristic (eg enthalpy H) / RT ~ 2 (1) Y in both formulas is a function of the equilibrium thermodynamic such as the vapor pressure of the liquid phase, the equilibrium constant of the reaction, etc., R is the gas constant, P is the pressure and T is the temperature.