Fluid property, characterising a stress $\begin{array}{l}\tau\end{array}$ arising in fluid due to shear or tensile deformation:

(1)	$\begin{array}{l}\displaystyle \tau = \mu \cdot \frac{\partial u}{\partial l}\end{array}$

where

$\begin{array}{l}\displaystyle \frac{\partial u}{\partial l}\end{array}$	shear velocity

Dimension	SI units	Oil metric units	Oil field units
M L^-1 T^-1	Pa⋅s	cp = 10⁻³ Pa⋅s	cp = 10⁻³ Pa⋅s

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