For 10 points, name this number that is greater than one for supersonic velocities.
The actual pressure coefficient is equal to the low velocity pressure coefficient divided by the square root of one minus this value squared according to the Prandtl-Glauert rule. When the local value of this approaches unity, the freestream value of it, is termed critical. When this number is equal to one at a nozzle, choked flow can occur and when it's less than 0.3, the flow is considered incompressible. This is equal to the velocity of the flow divided by the square root of the product of RT and the ratio of the specific heats at constant pressure and volume respectively. That denominator simplifies to the speed of sound in the medium, meaning this value is the ratio of velocity to the speed of sound. For 10 points, name this number that is greater than one for supersonic velocities.
The actual pressure coefficient is equal to the low velocity pressure coefficient divided by the square root of one minus this value squared according to the Prandtl-Glauert rule.
{Mach} number