Plate Theory and Extensions - The Compressibility of the Mobile Phase > Page 25
Now, if the retention volume of a solute at the outlet pressure (Po) is (Vr(o)) and the true retention volume is (Vr) measured at the mean column pressure (Pr), then
PrVr = PoVr(o)
It is now necessary to derive an expression for (Pr) and then the correction factor can be evaluated. The average pressure in the column (Pr) is defined as, .
Now it has been shown that