A type of diffusion pump in which the mercury vapor emerges from a nozzle, giving it motion in a direction away from the high-vacuum side of the pump.



Related Terms

DIFFUSION PUMP

A vacuum pump in which a stream of heavy molecules, such as mercury vapor, carries gas molecules out of the volume being evacuated; also used for separating isotopes according to weight, the lighter molecules being pumped preferentially by the vapor stream.

CAVITATION

Formation of an air or vapor pocket (or bubble) due to lowering of pressure in a liquid, often as a result of a solid body, such as a propeller or piston, moving through the liquid; also, the pitting or wearing away of a solid surface as a result of the collapse of a vapor bubble. Cavitation can occur in a hydraulic system as a result of low fluid levels that draw air into the system, producing tiny bubbles that expand explosively at the pump outlet, causing metal erosion and eventual pump destruction.

CAVITATION

Formation of an air or vapor pocket (or bubble) due to lowering of pressure in a liquid, often as a result of a solid body, such as a propeller or piston, moving through the liquid; also, the pitting or wearing away of a solid surface as a result of the collapse of a vapor bubble. Cavitation can occur in a hydraulic system as a result of low fluid levels that draw air into the system, producing tiny bubbles that expand explosively at the pump outlet, causing metal erosion and eventual pump destruction.

DELAMINATION WEAR

A complex wear process where a machine surface is peeled away or otherwise removed by forces of another surface acting on it in a sliding motion.

BACKING SPACE

Space between a fore pump and a diffusion pump in a leak-testing system.

NET POSITIVE SUCTION HEAD

The amount of pressure that is required on the suction side of the pump to prevent cavitation.

WESTWARD MOTION

The motion in a westerly direction of the subtrack of a satellite, including the motion due to the earth’s rotation and the nodical precession of the orbital plane.

MOLECULAR PUMP

A vacuum pump in which the molecules of the gas to be exhausted are carried away by the friction between them and a rapidly revolving disk or drum.

FREE-FLIGHT ANGLE

The angle between the horizontal and a line in the direction of motion of a flying body, especially a rocket, at the beginning of free flight.

SINGLE-ACTING PUMP

A reciprocating pump that pumps fluid on one side of the piston.

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