# Why whirlpool causes force towards its center?

Higher velocity implies low pressure. So in whirlpool the velocity of water have to decrease with radius in order to have force towards its center.

My question is how is explained whirlpool formation in simple words.

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A fluid motion in a vortex creates a dynamic pressure that is lowest in the center increasing radially ($P \propto r^2$). The gradient of this pressure that forces the fluid to rotate around the axis.
This is usually represented by a vector called vorticity, and defined by $\omega = \nabla \times v$.