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Coefficient of pressure is a ________

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Coefficient of pressure is a ________

(a) dimensional quantity

(b) dimensionless quantity

(c) negligible value

(d) cannot be determined

I have been asked this question in exam.

This question is from Pressure Coefficient in chapter Inviscid & Incompressible Flow of Aerodynamics

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Right option is (b) dimensionless quantity

Easy explanation: Although pressure is dimensional quantity, Coefficient of pressure is dimension less quantity. It is used throughout the aerodynamics from incompressible flow to hypersonic flow. In aerodynamics, it is very easy to find coefficient of pressure rather than pressure.

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