PROCESS can be used to prevent of rusting of IRON - By painting surface of an iron object, air and moisture cannot come in contact with the iron object and hence no rusting takes place,By applying grease or oil,By Galvanization, i.e. by depositing a thin layer of zinc metal on iron objects,By chrome-plating, i.e. Iron is coated with chromium,By alloying iron with carbon, chromium and nickel to make stainless steel.Centrifugation: It is a process in which particles are separated from a solution, using centrifugal force, ACCORDING to their density, size, shape, rotor speed and viscosity of the medium.During evaporation water changes from a liquid to a GAS or vapour.During crystallization, the ATOMS or molecules, of a solid form, are highly organized into a structure known as a crystal.