In all chromatography, a mobile phase and stationary phase is involved. In GC gas is a mobile phase and the column is a stationary phase. Various types of columns can be used for a different field, depends on the type of samples generally packed and capillary columns are used in GC.
The capillary column contains two parts, a tube, and a stationary phase. Capillary columns are available between 30 to 60-meter lengths, thin film between 0.1 to 10.0 µm, and diameter of inner wall between 0.05 to 0.53 mm I.D. With high molecular weight, thermally stable polymer coated on to the wall. Packed columns have a fine-divided, inert, solid support material coat with the liquid stationary phase. Generally packed columns are 1.5 to 10 m in length and 2 to 4 mm in internal diameter.
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