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焓者,熱理能量也。H=U+pV

闔子系統焓之和曰:H=kHk, Template:Mvar者,子系統總焓也;Template:Mvar者,各子系統也;Template:Mvar者,各子系統之焓也。

微分形式曰:dH=dU+d(pV)=TdSpdV+pdV+Vdp=TdS+Vdp