**AREA MACH NUMBER RELATION**

[ Gas dynamics – Yahya]

where,

A^{∗} is the area of the throat ( m^{2} )

A is the area of the nozzle exit ( m^{2 } )

M is the Mach number (No unit)

γ is the specific heat ratio (No unit)

The area-Mach number relation gives the ratio of the local area to throat area as a function of Mach number. The area-Mach number relation is valid for isentropic flows (i.e. no shocks allowed) and calorically perfect gases.