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@wikipedia


Absolute value of pressure gradient

LaTeX Math Inline
body\nabla p
 along the fluid flow direction 
LaTeX Math Inline
body\displaystyle {\bf l} = \frac{\bf u}{u}
:

LaTeX Math Block
alignmentleft
\frac{dp}{dl} = {\bf l} \cdot \nabla p

...

 LaTeX Math Inline
body\displaystyle {\bf l} = \frac{\bf u}{u}
, where 
 LaTeX Math Inline
body\bf u
 is the fluid velocity.
...
Physics / Fluid Dynamics 
[ Head loss ]