Which of the following is the ratio of absolute viscosity to mass density?
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A.
Specific viscosity
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B.
Coefficient of viscosity
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C.
Viscosity index
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D.
Kinematic viscosity
Correct Answer:
D. Kinematic viscosity
Explanation:
Kinematic viscosity is defined as the ratio of absolute (or dynamic) viscosity to the mass density of a fluid. While absolute viscosity measures the internal resistance of a fluid to shear stress, kinematic viscosity expresses this resistance relative to the fluid's density, often representing how momentum diffuses through the medium under the influence of gravity. In the SI system, it is measured in square meters per second (m2/s), and in the CGS system, the unit is the stoke (St). This property is essential in fluid dynamics for calculating the Reynolds number and analyzing flow behavior.
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