We will separate sand and water from their mixture by the process of sedimentation and decantation.
Sedimentation During this process, we leave mixture for some time, after that the sand which is heavier is settled down at the bottom.
Decantation After the above process, water is poured into another vessel and sand is left in first vessel. Thus, sand and water will be separated from their mixture.

Sieving is a method by which fine particles are separated from bigger particles by using a sieve. It is used in a flour mill, our homes and at construction sites.
In a flour mill, impurities like husk and stones are removed from wheat before grinding. At construction sites, pebbles and stones are removed from sand by sieving.

A saturated solution of a substance is the one in which no more of that substance can be dissolved.

The process of conversion of water vapour into its liquid form is called condensation.

The method to separate each component from the mixture is given below:
(i) Hand picking: It is used to separate iron nails from the mixture.
(ii) Decantation: The mixture is allowed to stand for some time. The clear liquid is poured to another container to separate oil from the mixture.
(iii) Evaporation: The remaining liquid is allowed to evaporate till residue is obtained. This residue is salt.