Mechanical Operations
Crushing efficiency is the ratio of the

Energy fed to the machine to the surface energy created by crushing
Energy absorbed by the solid to the surface energy created by crushing
Energy absorbed by the solid to that fed to the machine
Surface energy created by crushing to the energy absorbed by the solid

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Mechanical Operations
Higher is the mesh number, smaller will be the aperture size of the screen. It means that the aperture size of a 200 mesh screen will be smaller than that of 20 mesh screen. This is valid for

German standard screens (DIN 1171) etc
British standard screens
American standard screens (ASTM and Tyler standard screens)
All of these

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