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free space

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Definition of free space in English:

noun

[mass noun] Physics
Space unoccupied by matter or, more particularly, containing no electromagnetic or gravitational field and used as a reference.
Example sentences
  • Photons in free space act almost exclusively as waves.
  • Radiation from free space is a negligible additional contribution so is not included.
  • So they're essentially sitting in free space inside a vacuum chamber.

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