Which equation is used to calculate the viscosity of a fluid in a pipe?

Which equation is used to calculate the viscosity of a fluid in a pipe?

Step 1: Understand what viscosity is. Viscosity is a measure of a fluid's resistance to flow.
Step 2: Learn about Poiseuille's law. This law describes how fluids flow through a pipe.
Step 3: Identify the formula from Poiseuille's law. The formula is: V = (π * r^4 * ΔP) / (8 * η * L), where V is the flow rate, r is the radius of the pipe, ΔP is the pressure difference, η is the viscosity, and L is the length of the pipe.
Step 4: Rearrange the formula to solve for viscosity (η). You can rearrange it to η = (π * r^4 * ΔP) / (8 * V * L).
Step 5: Use the rearranged formula to calculate the viscosity of the fluid in the pipe using the known values.

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