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Usage examples of vacua.

There was the extremely important project for securing and sealing in really good vacua in various electronic devices brought up by Joe and his crew in the supply ship.

Vatinio legatis, duas legiones in Aeduos deduxit, quorum in omni Gallia summam esse auctoritatem sciebat, duas in Turonis ad fines Carnutum posuit, quae omnem illam regionem coniunctam Oceano continerent, duas reliquas in Lemovicum finibus non longe ab Arvernis, ne qua pars Galliae vacua ab exercitu esset.

The Relative Proportion of the Heating Surfaces in the Elements of the Multiple Evaporator and their Actual Dimensions -- The Pressure Exerted by Currents of Steam and Gas upon Floating Drops of Water -- The Motion of Floating Drops of Water upon which Press Currents of Steam -- The Splashing of Evaporating Liquids -- The Diameter of Pipes for Steam, Alcohol, Vapour and Air -- The Diameter of Water Pipes -- The Loss of Heat, from Apparatus and Pipes to the Surrounding Air, and Means for Preventing the Loss -- Condensers -- Heating Liquids by Means of Steam -- The Cooling of Liquids -- The Volumes to be Exhausted from Condensers by the Air-pumps -- A Few Remarks on Air-pumps and the Vacua they Produce -- The Volumetric Efficiency of Air-pumps -- The Volumes of Air which must be Exhausted from a Vessel in order to Reduce its Original Pressure to a Certain Lower Pressure -- Index.

The two most famous lines are a procession of negatives:- Ibant obscuri sola sub nocte per umbram, Perque domos Ditis vacuas et inania regna.