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Viscosity

The internal frictional force which resists the flow of a liquid is directly proportional to A (the area of contact of two adjacent layers) and du (the velocity difference between two adjacent layers), and is inversely proportional to dx (the distance between the two adjacent layers). Taking all these factors into account, we express frictional force F as
 
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where du/dx is called the velocity gradient.
or Description: 45400.png




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