Cryogenic Fluids Density Reference System: Provisional Accuracy Statement (1980)

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Description

Abstract: The improved Density Reference System, the reference densimeter, and the method of determining sample density are described. The uncertainty of the density reference system is + 0.055%. The contribution from the estimated systema -ic error in density was + 0.022%. The estimated uncertainty caused by random error is three times the standard deviation of 0.011% and is based on sixty-three measurements of the densities of saturated liquid methane. The total density uncertainty is taken to be the sum of the systematic and random errors. This applies to the density range of 400 to 480 kg/m at pressures from 0.8 ... continued below

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52 p. : ill. ; 28 cm.

Creation Information

Siegwarth, J. D. & LaBrecque, J. F. April 1981.

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  • Main Title: Cryogenic Fluids Density Reference System: Provisional Accuracy Statement (1980)
  • Series Title: NBS Technical Note
  • Added Title: National Bureau of Standards Technical Note 1041

Description

Abstract: The improved Density Reference System, the reference densimeter, and the method of determining sample density are described. The uncertainty of the density reference system is + 0.055%. The contribution from the estimated systema -ic error in density was + 0.022%. The estimated uncertainty caused by random error is three times the standard deviation of 0.011% and is based on sixty-three measurements of the densities of saturated liquid methane. The total density uncertainty is taken to be the sum of the systematic and random errors. This applies to the density range of 400 to 480 kg/m at pressures from 0.8 to 4 bar absolute and temperatures between 109 and 128 K. This accuracy statement is expected to apply over ranges of at least 400 to 1000 kg/m3 in density, 77 to 300 K in temperature, and 0.8 to 7 bar in pressure though the accuracy over these ranges has not been verified.

Physical Description

52 p. : ill. ; 28 cm.

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Digitized from microfiche (1).

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  • April 1981

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  • Jan. 27, 2017, 10:19 a.m.

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  • Feb. 28, 2017, 8:34 a.m.

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Siegwarth, J. D. & LaBrecque, J. F. Cryogenic Fluids Density Reference System: Provisional Accuracy Statement (1980), report, April 1981; Washington D.C. (digital.library.unt.edu/ark:/67531/metadc502552/: accessed August 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.