Prandtl number is the reciprocal of

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Prandtl number is the reciprocal of

A. $$\frac{{{\text{Thermal diffusivity}}}}{{{\text{Momentum diffusivity}}}}$$

B. Thermal diffusivity × Momentum

C. Thermal diffusivity × Mass diffusivity

D. Mass diffusivity × Momentum diffusivity

Answer: Option A

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