Gas chromatography
It is important that the oven is capable of maintaining a constant temperature.  Since movement of the sample through the column relies on the boiling point of the sample being analyzed, the oven should be set to a temperature that is slightly higher than its boiling point.  For samples with a large boiling range, a temperature program can be used, in which the column temperature is raised.  By using a high temperature, the sample moves through the column faster, while at lower temperatures the sample moves slower, but better resolution is achieved.