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23rd May 2005, 07:50

#3 (permalink)

stuharri2002

Join Date: Jun 2003

Location: UK

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Mach No = V/a
Where:
V is speed in m/s and a is the speed of sound.
a = SQRT(Gamma x R x T)
where:
Gamma = ratio of specific heats (normally 1.4 for dry air)
R = Gas constant (normally 287.0519)
T = temperature (in kelvin)

hope this helps

stu