Identifier: philtrans00454680 (find matches)
Title: The Thermal Conductivity of Air
Year: 1919 (1910s)
Authors: Hercus, E. Laby, T.
Subjects: Proceedings of the Royal Society of London Philosophical Transactions of the Royal Society
Publisher: Royal Society of London

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cule. He found /=15(7-l)/4which gives/= 2*5 for helium and argon, and/= 1*507 when 7 = 1*402 asit is for the diatomic gases, and /= 1*1 for carbon dioxide, where 7 = 1*3.The agreement with experiment is very poor. Nevertheless when 7 is plotted against /, as is done in fig. 4, the twoquantities appear to be linearly related. The straight line in fig. 4 isdrawn through the point / = 2*5, 7 = 5/3 (the theoretical value for argonand helium), and close to the point representing / and 7 for carbon dioxide, a * We have not included mercury in Table IV, nor do we discuss it further, becausethe only observation of the viscosity of mercury (by Koch) appears to be inaccurate,as its variation with temperature is anomalous. t < Ann. d. Physik, vol. 11, p. 303 (1903). I Boltzmann, Pogg. Ann., vol. 157, p* 457 (1876). The Thermal Conductivity of Air. 209 gas for which both are known with high accuracy. This makes the equationof the line/=2-816 7-2-2. ■65- 1-6 - 1-5 1-4 - l-25_ m* /co2 C*l-L/S0
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AIR N20XH2 1-6 2-0 Fig. 4.(Abscissse/, Ordinates y.) 1-2 2-4 It will be noticed that the points for the six gases H2, N2, 02, air, NO, andCO fall on this straight line, and Cl2, N20, CH4, C2H4 fall near it. H2S is notnear it. But it is to be noticed that in the case of Cl2, S02 and H2S the s 2 210 Dr. C. Chree. Electric Potential Gradient and only determination of h is by Eueken,* and that eight of his values of h arelow compared to those of other observers. If the values of 7 we have usedfor CI2, S02, and H2S are correct, the direction of the displacement of thepoints for these gases from the straight line would arise from using a lowvalue of h in deriving/. In conclusion, we wish to express our indebtedness to Mr. M. Alexander,M.Sc., who carried out part of the preliminary work, and calibrated some ofthe instruments used; to Mr. H. S. Tily, who took the measurements of thediscs; and to Mr. H. E. Strawbridge, whose skilful execution of the mechanicalwork made the success of the exper

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