In common way, we notice many things change automatically. Crops change from time to time, leaves of plants get dry, and flowers of plants get down after a certain time. In our body, many changes happen from time to time, like hair growth and nail growth. In our surroundings, some change is done by nature, and some change is done by humans. You can make a list of what changes around us happened by nature and what by humans.

Can all changes always be reversed?

In upper you make list change around us by nature, and humans now notice all the change gets reversed or not. Most of the changes are not reversed, like dry leaves will never get green and long hair can’t be short. But some changes get reversed. In chapter 5 notes for class 6 science, we study a mixture of soil and salt that gets reversed in the same position. If we blow air into a balloon, it will change, but if we open the face of the balloon, it will come back in the same position. Here are some examples of reversed or not reversed:

Reversed change:

These are those changes that can get back to their original position after change; this is called reversed change.

1. Wollen yarn to knitted sweater
2. Paper to paper airplane
3. Cold milk to hot milk
4. Dust and rice after mixture

Irreversible change-

These are those changes that can’t be gotten back to their original position after change. This is called irreversible change.

1. Egg to boiled egg
2. Paper to cutting paper toys
3. Wheat to floor
4. Bud to flower
5. Small hair to long hair
6. Milk to paneer
7. Milk to curd

These are the examples of how change around us will be reversed or not. According to your knowledge, you can add some more examples.

Type of Change Around Us:

There are many reasons or types of change; let’s discuss these types:

Physical Change:

In this change, the substance changes their physical position. In this change, most of the changes are reversable.

Chemical Change:

In this change, the substance changes due to a chemical reaction. These changes are irreversible.

Expansion and Contraction:

In this change, the substance changes due to the temperature effect. Some substances get expanded due to heat, and some get swollen due to cold. Most of these changes are reversible.

Reasons for Changes Around Us:

Nature and humans are both the main reasons for change around us, but there is a certain reason why people who play an important role in changes around us are following:

Force: –

This is mainly applicable to physical changes. By applying force, you can change the physical appearance of any substance or material. The road of iron change into sheet is an example of force.

Temperature: –

By increasing or decreasing temperature, a lot of substances get changed. Ice cream melts when we increase the temperature, and water can change into ice by decreasing the temperature.

Natural: –

Most of the changes are done by natural processes. Drying of tree leaves is a natural process.