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Match the following non-dimensional numbers with the corresponding definitions:

$\begin{array}{|c|c|c|cI|} \hline {}  & \textbf{Non-dimensional number} & {} &  \textbf{Definition} \\ \hline \textbf{P} & \text{Reynolds number} & \textbf{1} & \dfrac{\text{Buoyancy force}}{\text{Viscous force}} \\ \\ \hline \textbf{Q} & \text{Grashof number} & \textbf{2} & \dfrac{\text{Momentum diffusivity}}{\text{Thermal diffusivity}} \\ \\ \hline \textbf{R} &  \text{Nusselt number} & \textbf{3} & \dfrac{\text{Inertia force}}{\text{Viscous force}} \\ \\ \hline \textbf{S} & \text{Prandtl number} & \textbf{4} & \dfrac{\text{Convective heat transfer}}{\text{Conduction heat transfer}}  \\ \\ \hline \end{array}$

  1. $P-1, Q-3, R-2, S-4$
  2. $P-3, Q-1, R-2, S-4$
  3. $P-4, Q-3, R-1, S-2$
  4. $P-3, Q-1, R-4, S-2$
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