What is the SI unit of the coefficient of viscosity?
Correct answer B. kg m⁻¹ s⁻¹
Explanation
From Stokes' law F = 6πηrv, η = F/(6πrv), giving units of N ÷ (m × m s⁻¹) = kg m⁻¹ s⁻¹, which is the same as pascal second.
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