Sieving is a separation technique based on the difference in particle size. It is a traditional and easy method of separation that doesnt require much skill and is cheap since the installation cost is low. Sieving is used to separate solid mixtures that have components of different sizes. A sieve is a shallow vessel having small holes at its bottom, and it is responsible for retaining the larger particles. The fine sand and coarse sand can be separated by sieving, as there is a difference in the size of particles in the mixture. Sieving is useful when there is a difference in size of particles in the mixture, and it is possible to separate smaller particles from bigger particles. However, sieving cannot separate two substances in a mixture that have the same size, for example, it cannot separate a mixture of chalk powder from flour.