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Chromatography is the separation of a mixture by passing it in solution or suspension or as a vapor through a medium in which, the components move at different rates.

It involves a sample being dissolved in a mobile phase (which may be a gas, a liquid or a supercritical fluid).

Then, mobile phase is then forced through an immobile, immiscible stationary phase.

The phases are chosen such that components of the sample have differing solubilities in each phase.