Definition:Irrotational Motion

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Let $B$ be a body which is in motion.

Let the velocities of the individual particles of $B$ be defined by a vector field $\mathbf V$ over $B$.

Let the curl of $\mathbf V$ be zero.

Then the motion of $B$ is described as being irrotational.

Also known as

In the context of fluid mechanics, irrotational motion is often seen referred to as non-vortical motion.

Also see