Relation between gravity and the vacuum impedance is through Z0 = (dB/dT)/(dD/dT)
Why is Coax 50 Ohms? (#340) at https://www.youtube.com/watch?v=I-OnQZJv35I Thanks! Your explanation of 50 ohm cables was very helpful. I wrote a long comment about vacuum impedance you might find interesting. Richard Collins, The Internet Foundation I was going over transmission line theories and trying to get a better feeling for the vacuum impedance which CoData gives
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