Some measurements of the effect of gaseous imperfections on the critical pressure ratio in air and the speed of sound in nitrogen

Coleman dup Donaldson, Jim J. Jones
naca-tn-2437
Aug 1951


Experiments were made to measure the speed of sound in nitrogen at room temperature in the pressure range of 0 to 2000 pounds per square inch, and the critical pressure ratio of air expanded isentropically from stagnation conditions in the same range.

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http://naca.central.cranfield.ac.uk/reports/1951/naca-tn-2437.pdf