IAS = speed calculated from dynamic pressure (i.e. total - static),
Nah, we call it IMPACT PRESSURE these days.
Dynamic Pressure = 1/2Rho Vsquared where V is the TAS.
Impact Pressure = Total Pressure - Static Pressure.
I know that's not they way we all used to explain it in the past, but it is the way that we should be explaining it in these modern times.
Infirmity and beyond