a) an enclosed space, as that inside a vacuum tube, out of which most of the air or… … English World dictionary a space with nothing at all in it completely empty space 2. Vacuum tube - This article is about the electronic device. For experiments in an evacuated pipe, see free fall. Modern vacuum tubes, mostly miniature style In electronics, a vacuum tube, electron tube (in North… … Wikipedia For the transport system, see pneumatic tube. Vacuum distillation - At atmospheric pressure, dimethyl sulfoxide boils at 189☌. Under a vacuum, it distills off into the connected receiver at only 70☌. Vacuum distillation is a method of distillation whereby the pressure above the liquid mixture to be distilled is … Wikipedia Vacuum technology - Introduction all processes and physical measurements carried out under conditions of below normal atmospheric pressure.
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