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The question is: since Mach number refers to the local speed of
sound, it varies with altitude.
all Mach numbers referring to flying speed are (supposed to be)
quoted with respect to the speed of sound at a reference temperature?
Or are the numbers always quoted as local,
calculate for a layperson just what airspeed the craft is traveling
at?
While searching for information on this, I came across
http://www.physlink.com/Education/AskExperts/ae563.cfm
which strikes me as being pretty poorly worded on several levels.