MACH 5 AIR CONDITIONING
often only Mach ( / m ɑː k / · German: [ · max] · 1 ] · [ · 2 ] · It is named after Austrian-Czech physicist and philosopher Ernst Mach . M = u c · {\displaystyle \mathrm {M} ={\frac {u}{c}} · } where: M is the local Mach number · u is the local flow velocity with respect to the boundaries (either internal · such as an object immersed in the flow · or external · like a channel) · and c is the speed of sound in the medium · which in air varies with the square root of the thermodynamic temperature . By definition · at Mach   · the local flow velocity u is equal to the speed of sound. At Mach   · 0.65 · u is 65% of the speed of sound (subsonic) · and
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