How Does Helium's Dielectric Constant Vary with Temperature?

Gokul43201
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I'm having trouble finding reliable data on the dielectric constant of helium(4) gas as a function of temperature, from 4K up.

Grateful for any help
 
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Nevermind, I got the data from NIST.
 
Thread 'Motional EMF in Faraday disc, co-rotating magnet axial mean flux'

Thread 'Motional EMF in Faraday disc, co-rotating magnet axial mean flux'

So here is the motional EMF formula. Now I understand the standard Faraday paradox that an axis symmetric field source (like a speaker motor ring magnet) has a magnetic field that is frame invariant under rotation around axis of symmetry. The field is static whether you rotate the magnet or not. So far so good. What puzzles me is this , there is a term average magnetic flux or "azimuthal mean" , this term describes the average magnetic field through the area swept by the rotating Faraday...
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