Absolute value of pressure gradient Pressure gradient

LaTeX Math Inline

body	\displaystyle \frac{dp}{dl}

along the fluid

nabla p

along the fluid flow direction

LaTeX Math Inline

body	\displaystyle {\bf l} = \frac{\bf u}{u}

, :

LaTeX Math Block

alignment	left

\frac{dp}{dl} = {\bf l} \cdot \nabla p

where

LaTeX Math Inline

body	\bf u

is the fluid velocity.

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