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By Th. Von Kármán

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Let us only remember that at the beginning of this century viscous flow at high Reynolds numbers was practically intractable with the old methods, especially if turbulence occurred, but owing to the work of Prandtl, Karman, Taylor, Dryden, and many others these problems are now solved to quite a considerable extent. So there never is room for despair. ACKNOWLEDGMENTS I would like to thank Mr. H. Baumann and Dr. H. Sprenger (Institute of Aerodynamics) for their valuable help in the preparation of this lecture and the demonstration.

1875. The Collected Works. New York, 1928. 166. 26. , Heat-Capacity Lag in Gasdynamics. / . Chem. Phys. 14, (1946), 150. 27. , Transient Phenomena in Supersonic Flow—in L. RIDENOUR: Modem Physics for the Engineer. New York, 1954. 362. 28. , Ueber Widerstände, die durch gasdynamische Relaxation hervorgerufen werden. Zeitschrift für Flugwissenschaften 4, (1956), 14-17. 29. , Handbuch der Experimentalphysik, Vol. 4, part 1 Leipzig, 1931. 357-358. 30. LORENTZ, H. , Les théories statistiques en thermodynamique.

20. Experiment of Kantrowitz, showing loss of stagnation pressure in consequence of an entropy increase by relaxation. But the formula contains an astonishing paradox, as there is no influence of the nature of the gases. So two gases of identical nature would show the same increase, contrary to experience where nothing happens if a separating wall in a mass of gas is drawn out. The paradox is that the slightest difference gives an effect, but complete identity gives none. This suggests that the calculation of entropy must in reality be a counting process.

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