Question

The unit of dynamic viscosity of a fluid is

• A. $m^2/s$
• B. $Ns/m^2$
• C. $Pa{s}^2/m^2$
• D. $kg{s}^2/m^2$

Answer 1

The correct option is B $Ns/m^2$

Dynamic velocity,

$\mu =\frac{shearstress}{\frac{Changeofvelocity}{Changeofdistance}}$

$=\frac{Force/(length{)}^2}{1/Time}$

$=\frac{force\times time}{(length{)}^2}$ $=\frac{Ns}{m^2}$