Mechanical Operations
In screen analysis, the notation +5 mm/-10 mm means particles passing through

Neither 5 mm nor 10 mm screen
Both 5 mm and 10 mm screens
10 mm screen and retained on 5 mm screen
5 mm screen and retained on 10 mm screen

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Mechanical Operations
Rittinger's crushing law states that

For a given machine and feed, crushing efficiency is dependent on the size of the feed & product
Work required in crushing is proportional to the new surface created
Work required to form a particle of any size is proportional to the square of the surface to volume ratio of the product
Work required to form a particle of a particular size is proportional to the square root of the surface to volume ratio of the product

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