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vacuum
physics
- Key People:
- Robert Boyle
- Evangelista Torricelli
- Related Topics:
- vacuum technology
- atmospheric pressure
- space
- high vacuum
- outer space
- On the Web:
- CERN Accelerating science - A vacuum as empty as interstellar space (Jan. 01, 2025)
vacuum, 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.