For these cases, Onsager and others formulated a theory of nonequilibrium thermodynamics and showed that the second law continues to hold. 針對這類狀況，昂薩格等人提出了非平衡熱力學理論，並證明熱力學第二定律依然有效。
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. 根據氣液兩相相平衡熱力學模型研究了某揮髮油油藏在注天然氣過程中油藏體系相態特徵的變化規律。
