Horst Bettin and Hans Toth 2006 Meas. Sci. Technol. 17 2567 doi:10.1088/0957-0233/17/10/006
Solid density determination by the pressure-of-flotation method
Horst Bettin and Hans Toth
Show affiliationsAfter a short overview of flotation methods and experiments, basic equations for the pressure-of-flotation method are given including a temperature and composition dependence of the liquid's thermal expansion and compressibility. Then, the pressure-of-flotation experiment of PTB is described. A new calibration procedure using doped silicon samples is presented. Now, density comparisons of silicon samples can be performed with an uncertainty less than 0.1 ppm for density differences up to 10 ppm, i.e. for practically all undoped silicon samples. Current applications of the method and an outlook to future developments are discussed. Relative uncertainties of the order of 10−9 seem to be possible and would allow new applications.
- PACS
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06.20.fb Standards and calibration
- Subjects
- Dates
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Issue 10 (October 2006)
Received 9 May 2006, in final form 13 June 2006
Published 25 August 2006
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Solid density determination by the pressure-of-flotation method
Horst Bettin and Hans Toth 2006 Meas. Sci. Technol. 17 2567
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Ryogo Hirota et al 2001 J. Phys. A: Math. Gen. 34 10377
-
On some problems of topological dimension theory
Vitalii V Fedorchuk 2002 Russ. Math. Surv. 57 361
-
A Balance Method of Using the Quadrant Electrometer for the Measurement of Power
Hubert Parry 1920 Proc. Phys. Soc. London 33 217
-
Electron and hole centres in the x-irradiated elpasolite crystal
studied by means of electron paramagnetic resonance and electron nuclear double resonance
Th Pawlik and J-M Spaeth 1997 J. Phys.: Condens. Matter 9 8737
-
Effects of interference among three equidistantly arranged cylinders in a uniform flow
Masakazu Tatsuno et al 1998 Fluid Dyn. Res. 22 297
-
Amplification and phase conjugation of weak signals
O V Kulagin et al 1992 Sov. Phys. Usp. 35 506
-
Electron holography: A maximum entropy reconstruction scheme
T. Matsushita et al 2005 Europhys. Lett. 71 597
-
THE CONSTRUCTION OF ALL LOCALLY BICOMPACT AND ALL LOCALLY BICOMPACT PARACOMPACT EXTENSIONS
V K Zakharov 1978 Russ. Math. Surv. 33 267
-
A Monochromatically Ionized Layer in a Non-Uniformly Recombinant Atmosphere; with Applications to the D and E Ionospheric Regions.
Sydney Chapman 1954 Proc. Phys. Soc. B 67 717
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