An important parameter in the study of compressible flow is the speed of sound (or the sonic speed), defined as the speed at which an infinitesimally small pressure wave travels through a medium.
Speed of sound is given by the formula :
Where:
- c –Â Speed of sound in m/s
- k – specific heat ratio(1.4)
- R – Gas constant ( 0.287)
- T – Temperature in kelvin.
A second important parameter in the analysis of compressible fluid flow is the Mach number , the ratio of the actual speed of the fluid (or an object in still fluid) to the speed of sound in the same fluid at the same state:
Where:
- V – velocity of air
- c – speed of sound
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