Mechanical Operations
Weber number is significant and is concerned with the

Suspension of solid in liquid
Dispersion of liquid in liquid
Liquid-liquid mixing
Solid-liquid mixing

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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

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

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