GHK equation simulator and Nernst equation calculator

Here is the Nernst equation: $E_X=\frac{RT}{zF}\ln \left(\frac{[X{]}_{\text{out}}}{[X{]}_{\text{in}}}\right)$

Here is the GHK equation: $V_m=\frac{RT}{F}\ln \left(\frac{P_{\text{K}}[K^{+}{]}_{\text{out}}+P_{\text{Na}}[N{a}^{+}{]}_{\text{out}}}{P_{\text{K}}[K^{+}{]}_{\text{in}}+P_{\text{Na}}[N{a}^{+}{]}_{\text{in}}}\right)$

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Background information on the GHK equation