computes the pressure, density and temperature ratios in an isentropic
flow to zero velocity (0 subscript) and sonic conditions (*
Select an input variable by using the choice button
and then type in the value of the selected variable. The default input
variable is the Mach number, and by varying Mach number you can see the
effect on Mach angle. You can also select Mach angle as an input, and
see its effect on the other flow variables.