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Key terms: vacuum free space unit wave medium reference empty fields constant pressure quantum vacuum density pascal electromagnetic partial vacuum realization electric practice si units minus related physics classical equations approx hydrogen cosmic matter outer space parameter optical measurable us patent interstellar communication definition varepsilon temperature unattainable permeability unruh effect vacuum state permittivity patent office interpretation speed of light interplanetary reference state electromagnetic wave realization of free space Search external links cited by footnotes on Wikipedia page Free space: |
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