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The weakness of analytical methods of conductance calculations from the point of view of precision needed for metrological purposes is shown at the beginning of the paper. To eliminate the simplifications of analytical models Monte Carlo (MC) method is proposed to solve the problem of correction factors calculation with very smali uncertainties. The important details of computer program are given...
The Physikalisch-Technische Bundesanstalt (PTB), Germany, has recently constructed a new primary standard of Iow pressures based on the continuous expansion method. The paper is concerned with the properties of the gas flow in one of the calibration chambers of this standard. To describe these properties it is essential to know, with the smallest possible uncertainty the local gas densities at points...
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