Definition of free space in English:

free space

noun

Physics
  • [mass noun] Space unoccupied by matter or, more particularly, containing no electromagnetic or gravitational field and used as a reference.

    • ‘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.’
    space, free space
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