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Retention Distance and time

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HawaiianFlava:
How do you calculate Retention Distance if you are given time? So far all I know is that you can find retention time experimentally, and that the plate height is H = L/N. Can Distance = L in this equation? If so, N = 5.55(retention time)^2 / width(1/2) ^2.  I still dont understand how to calculate distance from retention time though... Thank you!
 

ATMyller:
Retention distance / total eluent distance = retention time / total experiment time.

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