[time-nuts] Cavity frequency air filled vs vacuum?

Jim Lux jimlux at earthlink.net
Wed Aug 19 08:41:16 EDT 2015

On 8/18/15 10:30 PM, Bruce Griffiths wrote:
> The ratio of the resonant frequency of the evacuated cavity to that
> of the air filled cavity increases by the square root of the relative
> permittivity of the ambient air or around 300ppm or so. Bruce

I believe that there are systems that measure humidity by this means. 
Water content has a strong effect on permittivity.  Although, since 
there's just not that much water in humid air, it's probably in the few 
ppm range, but easily measureable

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