Abstract

TWENTY-FIVE years ago what was known on the dynamics of gases, if acoustics and the study of steady motion at speeds small compared with that of sound (when the flow resembles that of a liquid) be omitted, could have been expounded in a few dozen pages. Since then, and more rapidly since 1943, the subject has grown into one which no single book can describe in its entirety. The primary stimulus was the increase in aircraft speeds ; but a secondary stimulus, the belated realization of workers in pure science that the phenomena show fascinating differences from those of classical physics, has become equally important. Supersonic Flow and Shock Waves By R. Courant K. O. Friedrichs. (Pure and Applied Mathematics, a Series of Texts and Monographs, Vol 1.) Pp. xvi + 464. (New York and London: Interscience Publishers, Inc., 1948.) 42s.

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