For 10 points, name this technique with column and thin-layer varieties.
The optimal velocity for running this technique can be found using the van Deemter equation, and certain values for it can be found using the Kovats index. One useful value for this technique, the retardation factor, can be found by taking the ratio of two migratory distances. In the "gas" type of it, an inert gas like helium is often used as the mobile phase, which along with the stationary phase is used in this technique to separate components of a mixture. For 10 points, name this technique with column and thin-layer varieties.
The optimal velocity for running this technique can be found using the van Deemter equation, and certain values for it can be found using the Kovats index.
chromatography