= Mach Number (NASA Glenn Research Center)
{c}
{title2=updated 2021-05-13}
Online text: https://www.grc.nasa.gov/www/k-12/airplane/mach.html
Issued and hosted by <NASA Glenn Research Center>. The footer credits <Nancy Hall> as editor and NASA official; no individual author byline is established. Last updated 13 May 2021, an online revision date.
Cited passages: speed-ratio definition; gas and temperature dependence; flight regimes; disturbance propagation and wind-tunnel similarity.
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