We see many things and changes around us. These things are made of different types of materials. Every day we come across many changes in our surroundings too. These changes may involve one or more substances.
For example:
Cooking of vegetables, setting curd from milk and even souring of milk is a change.
Stretched rubber band, paper tore into pieces, Chalk crushed into powder, changing of water into steam are also changes.
Properties such as shape, size, colour and state of a substance are called physical properties.
A process in which substance undergoes change in its physical properties is known as physical change. In such a change no new substance is formed.