Hi @kkanade !
The Mach number is defined as the ratio of the flow velocity (V) to the speed of sound (c):
M = V/c
This number defines whether a flow or vehicle is moving at subsonic (M<1), sonic (M=1), or supersonic (M>1) speed. Namely, whether is traveling slower, at the same speed, or faster than the speed of sound.
If a vehicle travels at Mach 2 it means that is moving at twice the speed of sound.
Hi @prajput ,
How much is the speed of sound?
Hello @kkanade , allow me to answer this one,
The speed of sound does not have a specific value but it depends on the medium. Indeed, it represents the velocity of propagation of a sound wave through a medium. Its more general expression, valid for all gases, is:
a = sqrt[ (dp/drho)_s ]
where s indicates an isentropic process.
A more commonly used expression, for the speed of sound, is the one for calorically perfect gases:
a = sqrt( gamma*R*T)
gamma is the ratio of the specific heats
R is the specific gas constant
T is the medium temperature
Hope that answers your question! 😎
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