water potential是衡量水參與反應的能力的主要指標之一。
water potential：水勢是指同溫同壓同一系統中，一偏摩爾體積（V）水（含溶質的水）的自由能(μw）與一摩爾體積（V）純水的自由能(μ0w)的差值(Δμw)。Water potential is defined as the difference in free energy per unit volume, between matrically -bound, pressurized, or osmotically- constrained water and pure water。
Ψw=(μw / Vw) - （μ0w／Vw) =(μw-μ0w)／Vw
=Δμw／Vw
代表水參與化學反應和移動的本領。
water potential是衡量水參與反應的能力的主要指標之一。
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