How do we separate impurities and bran from flour? why?

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Solution

Sieving: It is a method of separating a mixture of various sized particles by passing them through a suitable sieve.
Bran and impurities present in the flour are separated using a sieve while pebbles are separated from sand using a large sieve.
Hence we can use sieving as a method of separation only if components of a mixture are of different sizes.

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Separation process	The purpose for which we do the separation	What do we do with the separated components?
(1) Separate stones from rice.	(a) To separate two different but useful components.	(i) We throw away the solid component.
(2) Churning milk to obtain butter.	(b) To remove non-useful components.	(ii) We threw away the impurities.
(3) Separate tea leaves	(c) To remove impurities or harmful components.	(iii) We use both components.

2. Sita is preparing a dish in the kitchen. How will she remove bran and other impurities from flour and pulses?

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