A vacuum pump is a device that removes gas molecules from a sealed volume in order to leave behind a partial vacuum. The vacuum pump was invented in 1650 by Otto von Guericke.

A refrigeration vacuum pump is a device used to purge air conditioning and refrigeration (AC/R) systems of contaminants such as moisture and air. This purging action is achieved by inducing a deep vacuum in the system by continuously drawing small amounts of gas out over a protracted period. During this process, any water in the system is boiled off and the resultant vapor and any air is drawn out. Refrigeration vacuum pumps are typically rotary variants, many of which feature two stage operation. The vacuum values in question are expressed in microns with the average two stage vacuum pump capable of producing values of 50 microns or less.

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