The likely origin and calculability of physical constants

Kotyuk, A. F.; Хромов, А. В.

doi:10.1007/s11018-008-9080-7

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“…Efforts have been made to realize a definition with a sufficiently small uncertainty by fixing either the Planck constant with a watt-balance experiment or the Avogadro constant N a with a single crystal silicon sphere (X-ray crystal diffraction) method [1,18]. Within the work of redefinition research to link the unit of mass to a fundamental constant rather than an artefact, it is necessary to ensure a direct link between the primary realizations and the reference mass standards that ensure the dissemination of the mass.…”

Section: Introductionmentioning

confidence: 99%

Determination of Adsorption Layers on Silicon Sorption Artifacts using the Gravimetric Method

Darmaa

Chung

Park

et al. 2014

MAPAN

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The adsorption layers on the surface of silicon artifacts were determined experimentally as a function of relative air humidity in the range of 0.07 \ h \ 0.73 using the gravimetric method. 1 kg silicon sorption artifacts were fabricated with the same surface finish and material properties, but they had a very different surface area of 507.8 cm 2 . In this experiment, an ultra-precision mass comparator and special humidity control unit were used. We found that the sorption behavior of the silicon surface was type II by BET classification with the parameters l m = 0.017 lg/cm 2 , and c B = 9.3 from the adsorption isotherm of water vapor on the surface of silicon with R z \ 26.6 nm. The coefficient of water vapor adsorption in moist air was estimated as dl/dh = 65.3 ng cm -2 in a limited humidity range of 0.3 \ h \ 0.6.

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Section: Introductionmentioning

confidence: 99%