1. Take few pieces of ice in a beaker and heat them as shown in the following figure.
2. We notice that ice slowly melts and becomes water and on further heating.
3. If we reduce the temperature, the water vapour changes back to water and when the temperature is further reduced it changes to ice.
4. In the above activity we notice the change of the state of ice to water and to vapour but the substance, water, remains the same.
5. Changes of this type where no new substance is formed are known as physical changes.
6. When a material undergoes a change in shape, size, color or state it is called a Physical Change.
7. Generally, no new substance is formed in a physical change.
