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@wikipediaPressure difference, normalized by the distance at which the pressure values are measured:



Vector value showing a spatial gradient of pressure

direction of pressure change in space a with absolute value of 

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


Sometimes explicit notation is used: 

LaTeX Math Inline
body{\rm

...

grad}

...

\, p

...

= \nabla p


The absolute value of pressure gradient

LaTeX Math Inline
body|\nabla p|
 is showing the pressure difference, normalized by the distance at which the pressure is measured:


See also

...

Physics