Question

describe poiseuille's method to determine viscosity of a liquid with necessary theory
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Answer 1

Answer:

Determination of coefficient of viscosity of water by Poiseuille's flow method. Poiseuille investigated the steady flow of a liquid through a capillary tube. He derived an expression for the volume of the liquid flowing per second through the tube

Explanation:

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Answer 2

Answer:

Poiseuille investigated the steady flow of a liquid through the capillary tube.the  derived an expression for the volume of the liquid flowing per second through the tube.

Consider a liquid of co-efficient of viscosity η flowing, steadily through a horizontal capillary tube of the  length l and radius r. If P is the pressure difference across the ends of the tube, then the volume V of the liquid flowing per second through the tube depends on η, r and the pressure gradient p/l.

Explanation:

Determination of coefficient of viscosity of water by Poiseuille's flow method

A capillary tube of very fine bore is connected by means of a rubber tube to a burette kept vertically. The capillary tube is kept horizontal as shown in Fig.. The burette is filled with water and the pinch - stopper is removed. The time taken for water level to fall from A to B is noted. If V is the volume between the two levels A and B, then volume of liquid flowing per second is V/t. If l and r are the length and radius of the capillary tube respectively, then

V/t = πPr4 / 8 η

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