cuicocha t1_izv04fo wrote
Reply to comment by Psyese in Why do sonic booms happen at the speed of sound specifically? What does the speed of wave propagation have to do with the compression of air in front of a moving object? by SS7Hamzeh
A shock is a significant discontinuity in pressure, density, and velocity. Viscosity means that nothing is truly discontinuous, so in sea-level air, "discontinuous" means a big jump in a distance of approximately microns.
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