My notes mention sonic transition of a fluid. Is it where the speed of the fluid elements cross the speed of sound in the medium they are located?
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1$\begingroup$ Yes. It is the location where the mach number $M\equiv v/c_{\rm sound}=1$. Is there anything more specific you wish to ask? $\endgroup$– AtmosphericPrisonEscapeCommented Mar 15, 2021 at 0:42
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$\begingroup$ Thank you, that's all. $\endgroup$– zabopCommented Mar 15, 2021 at 6:48
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