Articlehybrid1988

Measurement of the universal gas-constant R using a spherical acoustic resonator

Michael R. Moldover · J. P. Martin Trusler · T.J. Edwards · James B. Mehl · Richard Davis

253 citations0/0 files storedJournal of Research of the National Bureau of Standards

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Scientific Measurement and Uncertainty Evaluation Chemical Thermodynamics and Molecular Structure Calibration and Measurement Techniques

Abstract

We report a new determination of the Universal Gas Constant R: (8.314471 ±0.OOOOI4)J.mol-1K-1 • The uncertainty in the new value is 1.7 ppm (standard error), a factor of 5 smaller than the uncertainty in the best previous value.The gas constant was determined from measurements of the speed of sound in argon as a function of pressure at the temperature of the triple point of water.The speed of sound was measured with a spherical resonator whose volume was determined by weighing the mercury required to fill it at the tem-perature of the tri~le point.The molar mass of the argon was determined by comparing the speed of sound in it to the speed of sound in a standard sample of argon of accurately known chemical and isotoptic composition.

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