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Grashof number signifies the ratio of

1. inertia force to viscous force
2. buoyancy force to viscous force
3. buoyancy force to inertia force
4. inertia force to surface tension force

Correct answer: buoyancy force to viscous force

Solution

The Grashof number is a dimensionless quantity that compares the buoyancy forces, which drive fluid motion due to density differences, to the viscous forces that resist this motion, thereby indicating the relative importance of these forces in natural convection scenarios.

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