Eunice asked me what is 'gas chromatography'?
My simple answer here is, gas chromatography uses the same principle like paper chromatography. (I assume that you already know what paper chromatography is.)
Firstly, like paper chromatography, the sample mixture you want to separate is in small quantity. In paper chromatography, the sample is a colour dye mixture. In gas chromatography, it is a mixture of chemical compounds.
Secondly, it needs a carrier. In paper chromatography, the carrier is a solvent, e.g. alcohol. In gas chromatograpgy, the carrier (inert) gas acts like a solvent, it will carry the different components of the chemicals at different speed.
Thirdly, in paper chromatography, you see different colour bands being displayed. In gas chromatogragphy, different components of chemical being seperated and detected by the detector as the result.
For more details, the link on on gas chromatogrpahy is here.
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