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Ratio of molecular diffusivity to thermal diffusivity is also known as?

Ratio of molecular diffusivity to thermal diffusivity is also known as? Correct Answer Prandtl number

Prandtl number as explained by others here, is a dimensionless number, which is the ratio of molecular diffusivity of momentum to molecular diffusivity of heat. It shows the relative thickness of the velocity boundary layer to the thermal boundary layer.

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