The thermal conductivity of benzene and toluene |
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Authors: | M. L. V. Ramires F. J. Vieira dos Santos U. V. Mardolcar C. A. Nieto de Castro |
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Affiliation: | (1) Centro de Química Estrutural, Complexo I, Instituto Superior Técnico, 1096 Lisbon Codex, Portugal |
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Abstract: | The thermal conductivity of liquid toluene and benzene was measured in the temperature range 298 to 370 K, near the saturation line, using an absolute transient hot-wire technique. The measurements were made in a modified version of an existing instrument, equipped with a new automatic Wheatstone bridge, computer controlled. The bridge measures the time that the resistance of a 7-m-diameter platinum wire takes to reach predetermined values, programmed by the computer. The computer can generate up to 1024 analog voltages, via a 12-bit D/A converter. The accuracy of the measurements with this new arrangement was assessed by measuring the thermal conductivity of a primary standard, toluene, at several temperatures and was found to be of the order of 0.3%. Benzene was chosen because it is under study as a possible secondary standard for liquid thermal conductivity by the Subcommittee on Transport Properties of IUPAC.Paper presented at the Tenth Symposium on Thermophysical Properties, June 20–23, 1988, Gaithersburg, Maryland, U.S.A. |
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Keywords: | benzene thermal conductivity toluene transient hot-wire method |
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