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 fo…

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How does a turbomolecular pump work - Leybold

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