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Absolute value of pressure gradient:

LaTeX Math Block
alignmentleft
\

...

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


along the fluid the fluid flow direction 

LaTeX Math Inline
body\displaystyle {\bf l} = \frac{\bf u}{u}
, where
LaTeX Math Inline
body\bf u
 is the fluid velocity.

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