What are the standard units used for kinematic viscosity____________________?
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Answer: A. metres2 per sec
Explanation
Kinematic viscosity is defined as dynamic viscosity divided by fluid mass density. Dimensional analysis yields units of length squared divided by time for this property. Standard international SI units are therefore expressed explicitly as meters squared per second. Dynamic viscosity has units of pascal-seconds or newton-seconds per square meter. Density is measured in kilograms per cubic meter in the metric system. Stokes is a traditional centimeter-gram-second unit often used for kinematic viscosity measurements.
Fluid dynamicists use kinematic viscosity when calculating Reynolds numbers for pipe flow regimes. Lubrication specifications frequently list kinematic viscosity ratings at standard operating temperatures. Boundary layer equations simplify significantly when expressed using kinematic viscosity terms. Newton-sec per metre represents dynamic viscosity rather than kinematic viscosity units. Mass time per length units correspond to entirely different mechanical property dimensions. Stating none of the above is wrong because meters squared per second is correct.
- Subject
- Engineering
- Category
- Mechanical Engineering
- Topic
- —
- Difficulty
- medium
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