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## Homework Statement

What does 'dv and dx' mean in f = eta A (dv/dx) in coefficient of viscosity?

2. Homework Equations

2. Homework Equations

What does 'dv and dx' mean in f = eta A (dv/dx) in coefficient of viscosity?

## The Attempt at a Solution

As I know v = velocity and x = distance. then what does 'dv' and 'dx' express here. Kindly explain.