See my above reply. Speed of sound doesn't mean much if there is a constantly softening gradient. https://en.m.wikipedia.org/wiki/Hagen%E2%80%93Poiseuille_equa

See my above reply. Speed of sound doesn't mean much if there is a constantly softening gradient. https://en.m.wikipedia.org/wiki/Hagen%E2%80%93Poiseuille_equation#Poiseuille's_equation_for_an_ideal_isothermal_gas https://en.m.wikipedia.org/wiki/Hagen%E2%80%93Poiseuille_equ... Edit: To give a good analogy: Electricity also travels at the speed of light through a cable, however due to resistance you will get different current reading depending on where you measure.