Question

sieve used to separate _ have very fine pores​

Answer 1

Explanation:

different size

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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Answer 2

The aggregate should be oven-dried at high temperature before sieving to prevent lump formation of the fine particles due to moisture content, which might clog the fine sieve holes.