Question

1.what material passes through a hole of a strainer when sieving is used to separate mixtures?
2.what is the difference between sieving from filtering​

Answer 1

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.

Answer 2

The questions are answered below-

1. When sieving is used to separate mixtures, the materials that move through pores of the strainer are- Fine particles.

• Sieving is the physical separation method in which small size particles are separated from large size particles using a sieve.
• The principle behind the separation of particles is the difference in particle size. The small size particles move through the sieve while large size particles remain on the sieve. For example- separation of husk from flour.

2. The difference between sieving and filtering is-

• The sieving method is used to separate desired solid material from undesired solid materials while filtering method is used to separate liquid substances from insoluble solid materials.
• In sieving, a sieve is used to separate mixtures while in filtering, a filter medium such as filter paper is used to separate mixtures.
• The mixture of pebbles and cement is separated by sieving while a mixture of sand and water is separated by filtration.