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air pump
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- Air pump - - A kind of pump for exhausting air from a vessel or closed space; also, a pump to condense air or force it into a closed space.
- Air pump - - A pump used to exhaust from a condenser the condensed steam, the water used for condensing, and any commingled air.
- Vacuum - n. - A space entirely devoid of matter (called also, by way of distinction, absolute vacuum); hence, in a more general sense, a space, as the interior of a closed vessel, which has been exhausted to a high or the highest degree by an air pump or other artificial means; as, water boils at a reduced temperature in a vacuum.
- Sprengel pump - - A form of air pump in which exhaustion is produced by a stream of mercury running down a narrow tube, in the manner of an aspirator; -- named from the inventor.