molecular drag pump

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molecular drag pump [mə′lek·yə·lər ′drag ‚pəmp]

(engineering)

A vacuum pump in which pumping is accomplished by imparting a high momentum to the gas molecules by impingement of a body rotating at very high speeds, as much as 16,000 revolutions per minute; such pumps achieve a vacuum as high as 10^-6torr.

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