The unit of the coefficient of viscosity in $S.I.$ system is
$m/kg{\rm{ - }}s$
$m{\rm{ - }}s/k{g^2}$
$kg/m{\rm{ - }}{s^2}$
$kg/m{\rm{ - }}s$
The unit of the coefficient of viscosity in $S.I.$ system is
$[\eta ] = M{L^{ - 1}}{T^{ - 1}}$ so its unit will be $kg/m-sec.$
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