Question

Give an example of sieving.

Answer 1

Hint: Sieving allows the fine flour particles to pass through the holes of the sieve while the bigger particles or impurities remain on the sieve. For example, in a flour mill, impurities like husk and stones are removed from wheat before grinding it.

Complete answer:
Sieving is a simple technique for separating particles of different sizes. A sieve such as used for sifting flour has very small holes. Coarse particles are separated or broken up by grinding against one another and the screen openings. Sieves are also used to separate stones from sand.
A device with meshes or perforations through which finer particles of a mixture (as of ashes, flour, or sand) of various sizes may be passed to separate them from coarser ones, through which the liquid may be drained from liquid-containing material, or through which soft materials may be forced for reduction to fine
Example of sieving:
Draining the water from a pot of noodles. Construction site: separating fine gravel from coarse gravel. In Laboratory using filter paper to separate a liquid and precipitate. In School separating the chalk from the chalk dust.

Note:
Advantages of the sieve analysis include easy handling, low investment costs, precise and reproducible results in a comparably short time and the possibility to separate the particle size fractions. This method is an accepted alternative to analysis methods using laser light or image processing. It is used in flour mills or building sites. Impurities such as husks and stones are extracted from wheat at the flour mill. They remove pebbles and stones from sand by sieving.