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%ما هو (من)٪ 1 - تعريف
QED vacuum
LOWEST-ENERGY STATE
Quantum electrodynamic vacuum
The QED vacuum is the field-theoretic vacuum of quantum electrodynamics. It is the lowest energy state (the ground state) of the electromagnetic field when the fields are quantized.
vacuum cleaner
![The power unit of a typical [[central vacuum cleaner]] for residential use](https://commons.wikimedia.org/wiki/Special:FilePath/Drainvac central vacuum with air inlet.jpg?width=200 "The power unit of a typical [[central vacuum cleaner]] for residential use")
![Astronaut [[Tracy Caldwell Dyson]] vacuums equipment on the [[International Space Station]]](https://commons.wikimedia.org/wiki/Special:FilePath/ISS-24 Tracy Caldwell Dyson during housekeeping.jpg?width=200 "Astronaut [[Tracy Caldwell Dyson]] vacuums equipment on the [[International Space Station]]")
![Kirby]] G5 vacuum cleaner](https://commons.wikimedia.org/wiki/Special:FilePath/Kirby G5 upright vacuum cleaner - 20140913.jpg?width=200 "Kirby]] G5 vacuum cleaner")
![A [[Mid-century modern]] styled canister vacuum](https://commons.wikimedia.org/wiki/Special:FilePath/Ruton vacuum cleaner pic2.JPG?width=200 "A [[Mid-century modern]] styled canister vacuum")
![Housemaid]] using "dedusting pump", {{Circa}} 1906.](https://commons.wikimedia.org/wiki/Special:FilePath/Vacuum Cleaner 1906.jpg?width=200 "Housemaid]] using \"dedusting pump\", {{Circa}} 1906.")
DEVICE THAT SUCKS UP DUST AND DIRT FROM FLOORS
Vacuum Cleaner; Vacuum cleaners; Vacuum Cleaners; Wet/dry vacuum; Hoovering; Vaccum cleaner; Dust sucker; Vacuumming; Vacuum cleaning; Vacuum sweeper; Vacuum belt; Vacuum filter; Vacuum Filter; Vacuum machine; Daniel Hess; Hoover Constellation; Shop vac; Shop-vac; Shop Vac; Shop-Vac; Shop vacuum; Shop vacuum cleaner; Vaccuum cleaner; Hoover (vacuum cleaner); Cyclonic vacuum cleaner; Vacuuming; Kruimeldief; Kruimeltjesdief
also vacuum-cleaner
(vacuum cleaners)
A vacuum cleaner or a vacuum is an electric machine which sucks up dust and dirt from carpets.
N-COUNT
Precision tests of QED
VERIFYING QUANTUM ELECTRODYNAMICS VIA MULTIPLE MEASUREMENTS OF THE FINE-STRUCTURE CONSTANT
Precision tests of quantum electrodynamics; Precision tests of qed; Tests of electromagnetism
Quantum electrodynamics (QED), a relativistic quantum field theory of electrodynamics, is among the most stringently tested theories in physics. The most precise and specific tests of QED consist of measurements of the electromagnetic fine-structure constant, α, in various physical systems.
