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What is Viscosity and why is it important?

What is Viscosity and why is it important?

The viscosity is the property of a fluid that resists the force tending to cause the fluid to flow. For liquids, it corresponds to the informal concept of “thickness”. For example, honey has a much higher viscosity than water. The viscosity usually depends on its composition and temperature. For gases and other compressible fluids, it depends on temperature and varies very slowly with pressure.