A Vacuum is a volume empty of matter there is free space and no pressure, in practice, only partial vacuums are possible in a laboratory or in space. In physics and applied engineering, the Vacuum is a volume containing little to no matter or a region with a gaseous pressure much less than atmospheric pressure. The Vacuum can be created by removing air from a space using a vacuum pump or by reducing the pressure using a fast flow of fluid, as in Bernoulli Equation. (Refer to the Vacuum Distillation)

Related Definitions in the Project: The Property and Unit