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*To*: tesla-at-pupman-dot-com*Subject*: Re: Variable Capacitance and Inductance*From*: "Tesla list" <tesla-at-pupman-dot-com>*Date*: Thu, 23 May 2002 18:08:52 -0600*Resent-Date*: Thu, 23 May 2002 18:10:09 -0600*Resent-From*: tesla-at-pupman-dot-com*Resent-Message-ID*: <JSe4AB.A.GpB.fTY78-at-poodle>*Resent-Sender*: tesla-request-at-pupman-dot-com

Original poster: "Ed Phillips by way of Terry Fritz <twftesla-at-qwest-dot-net>" <evp-at-pacbell-dot-net> Just thought of something else related to this topic. Precision resonant-cavity microwave frequency meter are capable of measurement accuracies measured in parts per million. It is often impractical to seal them hermetically and it is then necessary to correct the measurements for barometric pressure, humidity, and temperature. The corrections are very tiny! As an example, the dielectric constant of dry air at 68° F is 1.000536. That means the capacitance change of an air dielectric capacitor due to reducing the air pressure to zero or increasing it to two atmospheres would only be +/- 0.05%. Corrections under normal conditions will be much smaller than that. Ed

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