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This is a summary report of work done to date on NASA (Johnson Space Center) purchase order T-1738B concerning Radio Frequency (RF) Mass Quantity Gauging. Experimental apparatus has been designed and tested which measures the resonant frequencies of a tank in the "time domain. " These frequencies correspond to the total mass of fluid within the tank. Experimental results are discussed for nitrogen and hydrogen in normal gravity both in the supercritical state and also in the two phase (liquid-gas) region. Theoretical discussions for more general cases are given.

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