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Prandtl number signifies the ratio of

  1. $\frac{Momentum \: Diffusivity}{Thermal \: Diffusivity}$
  2. $\frac{Mass \: Diffusivity}{Thermal \: Diffusivity}$
  3. $\frac{Thermal \: Diffusivity}{Momentum \: Diffusivity}$
  4. $\frac{Thermal \: Diffusivity}{Mass \: Diffusivity}$
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