What is sieving? Where is it used?

(1) Sieving is a method in which fine particles are sieved through holes of the sieve while the bigger impurities remain on the sieve.

(2) Sieving is used in a flour mill to separate impurities like husk and stones from wheat before grinding it.

(3) It is also used at construction sites to separate pebbles and stones from sand.

(4) The size of the pore in the sieve depends on the size of the particles of the constituents to be separated.