Space in which there is no matter or in which the pressure is so low that any particles in the space do not affect any processes being carried on there. It is a condition well below normal atmospheric pressure and is measured in units of pressure (the pascal). A 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's principle.

This entry comes from Encyclopædia Britannica Concise.
For the full entry on vacuum, visit

Seen & Heard

What made you look up vacuum? Please tell us what you were reading, watching or discussing that led you here.