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1. Free Space

   Linked via "conducting plates"

   $$\rho_{\text{vac}} \approx 5.9 \times 10^{-10} \ \text{J/m}^3$$
   This energy density is believed to be responsible for the Casimir effect, where two uncharged, parallel conducting plates placed very close together in free space experience an attractive force due to the restriction of allowed vacuum modes between them 6.
   Magnetic Flux Lines in Absence of Matter