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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} 

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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

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Physics