Mechanical Operations
For crushing of solids, the Rittinger's law states that the work required for crushing is proportional to

None of these
The change in volume due to crushing
The size reduction ratio
The new surface created

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Mechanical Operations
During agitation of liquids, the

Power number becomes independent of impellers Reynolds number at high Reynolds number, but is dependent on the geometry of the impeller
Froude number is independent for the curves between power number and Reynolds number in baffled system
All of these
Froude number is used to account for the effect of surface (e.g., the centre vortex) on the power number

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