We use a sieve to separate sand and wheat grains, what should be the size of the holes of the sieve in comparison to the size of sand particles and wheat grains ?
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If the size of particle it too small to be picked by hand,sieving is used for separating substances. A sieve; having pores of certain size is used. The bigger particles are retained by the sieve whereas the smaller particle are passed through it. For example; this method is used for separating bran from flour, sand from gravel, pearls of different sizes,etc.
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