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Accommodation Coefficients for Heat Conduction Between Gas and Bright Platinum, for Nine Gases Between 80°K (or Their Boiling Points) and 380°K
1.Fellow of the Charles A. Coffin Foundation 1939–40;
1.E. I. du Pont Fellow 1940–11.
2.W. J. Taylor and H. L. Johnston, J. Chem. Phys. 14, 219 (1946).
3.H. L. Jolnston and E. R. Grilly, J. Chem. Phys. 14, 233 (1946).
4.E. H. Kennard, Kinetic Theory of Gases (McGraw‐Hill Book Company, Inc., New York, 1938), Sections 176–177.
5.The actual temperature of the gas at the surface will also differ from the temperature of the surface, although by an amount less than
6.It is assumed that, as in the case in the present measurements, the length of the mean free path in the gas is small relative to the diameter of the cell wire.
7.The “pressure” of this gas is to have a value such that the issuing stream contains the same number of molecules as the actual incident and reflected streams.
8.However in the present case the stream for is defined to contain the same number of molecules as the stream for (rather than for as in footnote 7).
9.E. H. Kennard, reference 4 (Sections 178–179).
10.C. T. Archer, Proc. Roy. Soc. (London) A165, 474 (1938).
11.H. S. Gregory (Spencer‐Gregory), Proc. Roy. Soc. (London) A149, 35 (1935).
12.H. Spencer‐Gregory and E. H. Dock, Phil. Mag. 25, 129 (1938).
13.L. B. Thomas and F. Olmer, J. Am. Chem. Soc. 65, 1036 (1943).
14.W. B. Mann, Proc. Roy. Soc. (London) A146, 776 (1934).
15.M. Knudsen, Ann. d. Physik 34, 593 (1911).
16.H. H. Rowley and K. F. Bonhoeffer, Zeits. f. Physik. Chemie B21, 84 (1933). Recalculated by Thomas and Olmer, reference 13.
17.I. Amdur, M. C. Jones, and H. Pearlman, J. Chem. Phys. 12, 159 (1944).
18.However, the accommodation coefficient calculated in references 10 to 12 is not identical with because the theory used by these workers differs from that presented here. In this connection, see the comment of Kennard (reference 4, pages 323–324), on the formula used by Dickins, reference 20 (Proc. Roy. Soc. (London) A143, 517 (1934)). Gregory (reference 11) presumably used the same formula as Dickins, while Archer (reference 10) and Spencer‐Gregory and Dock (reference 12) used a different theory developed by one of them.
19.However, the work of Amdur, Jones, and Pearlman (reference 17) indicates that in some earlier work, including that of Thomas and Olmer (reference 13), the pressure of the gas may have been too low to attain complete saturation of the surface. Accommodation coefficients measured in the region of partial saturation would be expected to be a function of the pressure of the gas.
20.W. Knudsen, Ann. d. Physik 6, 129 (1930).
21.K. Shafer, W. Rating, and A. Eucken, Ann. d. Physik 42, 176 (1942).
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