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In microscopic view, Circulation is a __________ quantity.

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In microscopic view, Circulation is a __________ quantity.

(a) vector

(b) dimension less

(c) scalar

(d) non-measurable

The question was posed to me during an interview.

My question is taken from Circulation in section Aerodynamics – Fundamental Principles and Equations of Aerodynamics

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Right choice is (c) scalar

Easiest explanation: In a macroscopic view, circulation is a scalar quantity as it is defined as the line integral of velocity field over a closed region. In a microscopic view, circulation is a flux of vorticity, which makes it a vector quantity.

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