In chemistry, "GLC" stands for gas-liquid chromatography. Gas-liquid chromatography is a technique used in analytical chemistry for analyzing and separating compounds that can undergo vaporization without decomposition. A typical application of GLC is in testing for purity of substances.
During the process, the components of a sample are dissolved in a suitable solvent and then vaporized in order to separate the analytes. The separation is achieved by distributing the sample between the stationary and the mobile phases. The mobile phase is an inert gas that serves to carry the molecules of the analyte through the heated column. The stationary phase is a microscopic layer of liquid on an inert solid support.