Device that measures a pressure gradient along a fluid column:

(1)	$\begin{array}{l}\displaystyle G_p = \frac{\Delta p}{\Delta l}\end{array}$

where

$\begin{array}{l}\Delta p = p_1 - p_2\end{array}$	difference between pressure sensors readings
$\begin{array}{l}\Delta l\end{array}$	distance between pressure sensors

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See also