Vacuum energy
vacuum energy
Background energy in a vacuum associated with constant vacuum fluctuations. Some astronomers believe vacuum energy to be the source of energy for the apparent acceleration of the expansion of the universe.
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- Vacuum extraction
noun the removal of a fetus from the uterus or vagina via a suction device Examples Vacuum extraction involves attaching a suction cup to the baby’s head and then gently pulling to help ease the baby down the birth canal.
- Vacuum fluctuation
vacuum fluctuation A spontaneous, short-lived fluctuation in the energy level of a vacuum, as described by quantum field theory. Although these variations are violations of the law of conservation of energy, they are tolerated in quantum mechanics by virtue of the uncertainty principle. Such fluctuations are associated with virtual particles.
- Vacuum forming
noun 1. a process in which a sheet of warmed thermoplastic is shaped by placing it in a mould and applying suction
- Vacuum frame
noun 1. (printing) a machine from which the air is extracted in order to obtain close contact between the surfaces of two materials, e.g. the film and plate during platemaking
- Vacuum-gauge
noun 1. a device for measuring pressures below atmospheric pressure in the receiver of an air pump, in steam condensers, and the like. vacuum gauge noun 1. any of a number of instruments for measuring pressures below atmospheric pressure