Gas constant of air, Rair = 286.97 m2/(s2·K) = 1716 ft2/(s2·°R)
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ΔG is the Gibbs free energy change during transfer of 1 mol of cations Xm+ from the phase A to B down the electrical potential, Δψ is the electrical potential difference (mV) between phases P and N (A and B), Xm+A and Xm+B are our cation concentrations on opposite sides of the membrane, F is the Faraday constant, R gas constant.