Gas chromatography is a group of analytical separation methods. In gas chromatography, the components of a sample are dissolved in a solvent and vaporized in order to separate the analyzing substances by distributing the sample between two phases: a stationary phase and a mobile phase.
So, gas-liquid chromatography is a method of separating analyzing substances, where the stationary phase is a liquid and the mobile phase is an inert gas, such as helium. How fast a particular compound travels through the machine will depend on how much of its time is spent moving with the gas as opposed to being attached to the liquid in some way. In gas-solid chromatography the stationary phase is in solid state.
The differences and similarities you can see by going to this link.
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