Depending on the value of the, a pipe is either laminar or turbulent. For a 10-m length of pipe, Re = PXD = 0.96 (1.94 #3) (0.5) (12 ft) of pressure drop.
A sound wave is moving through the atmosphere at a speed of 343 m/s. The sound wave has a wavelength of 0.1 cm.
The speed of sound in air at 20 °C (68 °F) is approximately 343 m/s (1,125 ft/s; 1,235 km/h; 767 mph; 667 kn), or 2.91 s for a kilometer and 4.69 s for a mile.
In general, sound travels slowly through gases, quickly through liquids, and quickly through solids.
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