Many changes are taking place around us automatically. In the fields, the crops sown change from time to time. Sometimes we see leaves falling from trees, changes colour and dry out. The flowers bloom and then it withers away. Did you realise earlier that so many changes are taking place around you every moment?
Reversible and Irreversible Changes
- First, take a balloon and blow it. Then take care that it does not burst. The shape and size of the balloon will change. Now, let the air escape the balloon. We will get back the balloon in the original condition.
- First, take some dough and make a ball. Then try to roll out a roti. Maybe you are not happy with its shape and wish to change it back into a ball of dough again.
- First, take the same balloon, blow it to its full size and tie its mouth with a string tightly. Prick it with the pointed tip of your pencil. We will see it will burst. We can never get back the original balloon again.
- Roll out a roti from the ball of dough and bake it on a tawa. We will never get the dough back.