For these cases, Onsager and others formulated a theory of nonequilibrium thermodynamics and showed that the second law continues to hold. 针对这类状况，昂萨格等人提出了非平衡热力学理论，并证明热力学第二定律依然有效。
Based on a thermodynamic model of gas_liquid equilibrium, the variation of phase behavior in a volatile oil system during gas injection has been investigated. 根据气液两相相平衡热力学模型研究了某挥发油油藏在注天然气过程中油藏体系相态特征的变化规律。
