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\[ V=\sqrt{\frac{2p_D}{\rho_{ASI}}} \]
If the density of the air is known. In an ASI, the density of air (\(\rho_{ASI}\)) is assumed to be a constant, and this constant is implemented mechanically into the architecture. The above formula is the '''definition''' of indicated airspeed, i.e. the airspeed that the ASI thinks the aeroplane is at.
==== Errors: TAS & IAS ====
