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Intercomparison of vacuum standards was carried out by using a spinning rotor gauge as a transfer gauge. The accommodation coefficient of the rotor was measured by the static expansion system at the Electrotechnical Laboratory and by the dynamic expansion system at the laboratorys Italian counterpart. The difference between coefficients measured in these two laboratories was 0.7%, which was smaller than the uncertainties of gauge calibration systems.

Intercomparison of Vacuum Standards of Japan and Italy.