Which of the following is not a correct expression regarding the units of coefficient of viscosity?

d y n e c m^{- 2} s

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d y n e c m^{2} s^{- 1}

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N m^{- 2} s

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P a . s

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Solution

The correct option is D $d y n e c m^{2} s^{- 1}$
Viscosity is the measure of a fluids resistance to flow. Co-efficient of viscosity is the ratio of shearing stress to velocity gradient. The SI unit of co-efficient of viscosity is $N . s / m^{2}$

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