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This topic has appeared in the English Wikipedia rankings 1 time. It first appeared on 2026-06-02 and was most recently seen on 2026-06-02.
A molecular drag pump is a type of vacuum pump that utilizes the drag of air molecules against a rotating surface. The most common sub-type is the Holweck pump, which contains a rotating cylinder with spiral grooves which direct the gas from the high-vacuum side of the pump to the low-vacuum side of the pump. The older Gaede pump design is similar, but is much less common due to disadvantages in pumping speed. In general, molecular drag pumps are more efficient for heavy gases, so the lighter gases will make up the majority of the residual gases left after running a molecular drag pump.
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