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Speeds of Sound in Dense Liquid and Vapor Pressures for 1,1-Difluoroethane

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Department of Chemistry and Material Technology, Faculty of Engineering and Design, Kyoto Institute of Technology, Kyoto 606-8585, Japan, and Department of Physical Chemistry, Institute of Chemical Technology, 166 28 Prague, Czech Republic
Cite this: J. Chem. Eng. Data 2004, 49, 6, 1652–1656
Publication Date (Web):October 29, 2004
https://doi.org/10.1021/je049925a
Copyright © 2004 American Chemical Society

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    Abstract

    Speeds of sound in the liquid phase of 1,1-difluoroethane, CHF2CH3, were measured by a sing-around technique operated at a frequency of 2 MHz. The results cover the temperature range along six isotherms from (243 to 333) K and pressures from near the saturation line to about 30 MPa. The combined uncertainty is estimated to be within ±0.2% except for the region near the coexistence line in the upper temperature range. The vapor pressure was also measured with an uncertainty lower than ±20 kPa by detecting the phase change using an acoustic absorption technique. The speeds of sound in the saturated liquid were estimated by the extrapolation to the vapor pressure from those in the compressed liquid. The temperature and/or pressure effects on the speed of sound are discussed and compared with data for some other hydrofluorocarbons reported elsewhere.

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     Kyoto Institute of Technology.

    *

     To whom correspondence should be addressed. E-mail:  urakawa@ kk.chem.kit.ac.jp. Tel. +81-75-724-7564. Fax:  +81-75-724-7562.

     Institute of Chemical Technology.

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