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It is the log mean value of the inert B in counterdiffusion usually used to find a flux.
P = pA1 + pB1 = pA2 + pB2
thus,
pB1 = P - pA1, and pB2 = P - pA2, so:
pBM = [pB2 - pB1]/ln(pB2/pB1) = [pA1 - pA2]/ln[(P-pA2)/(P-pA1)]
happy engineering :)
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