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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