What are the Physical Changes of a Substance
Physical changes are the changes in which no new substances are formed. For example, the formation of ice from water kept in a freezer is a physical change because the ice when kept in the open changes back to water.
In most of the physical changes, properties such as colour, shape, size, or physical form of the substance may change. Physical changes may or may not be reversible. An example of physical change is discussed below.
Crystals are the purest solid form of a substance having a definite geometrical shape. The process by which an impure compound is converted into its crystals is known as crystallization.
This process is used in obtaining common salt from seawater.
Let us take common salt as an example. Chemically, common or table salt is sodium chloride (NaCl). Common salt is obtained by evap