Empty space

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Empty space may refer to:


  • Outer space, especially the relatively empty regions of the universe outside the atmospheres of celestial bodies
  • Vacuum, a volume of space that is essentially empty of matter, such that its gaseous pressure is much less than atmospheric pressure
  • Free space, a perfect vacuum as expressed in the classical physics model
  • Vacuum state, a perfect vacuum based on the quantum mechanical model
  • In mathematical physics, the homogeneous equation may correspond to a physical theory formulated in empty space
  • Void, empty space.

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