Also called heat content or heat function. A thermodynamic function. If the internal energy is U , the pressure is p , and the volume is V , then enthalpy H is defined as H = U + pV . The word originates from the Greek enthalpo (to warm). For small changes under constant pressure, the amount of heat generated or absorbed is expressed as the change in enthalpy. The differential relationship is dH = TdS + Vdp . The condition for equilibrium in a system under adiabatic and constant pressure is when H is minimized. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
熱含量,熱関数ともいう。熱力学的関数の1つ。内部エネルギーを U ,圧力を p ,体積を V とするとエンタルピー H は H=U+pV で定義される。語源はギリシア語のエンタルポー (温まる) に由来する。等圧のもとにおける微小変化に対しては,発生または吸収される熱量はエンタルピーの変化で示される。微分形の関係式は dH=TdS+Vdp である。断熱・等圧のもとにおける系の平衡の条件は,H が極小になることである。
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