PhysicsChanges Around UsTypes of Changes

Types of Changes

Table of Contents

  • Types of Changes
  • Factors Causing Changes
  • Summary
  • Did You Know?
  • What’s Next?

In the previous segment, we learnt about the concept of changes. In this segment, we will learn about the two types of changes.

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    What are the types of changes?

    There are many factors that can bring about changes in various substances. These changes are of two types:

    Reversible change

    Changes that can be reversed are Reversible changes. This means the object or substance that undergoes the change can be restored to its original state.

    Examples of reversible change

        • When air is blown into a balloon, it fills up completely and when the air is released, the balloon deflates to its original shape and size.
        • Paper folded to make plane models can be unfolded to get its original shape.

    Irreversible change

    Irreversible changes are the changes that cannot be reversed. This means the object or substance that undergoes the change, cannot get back to its original state.

    Examples of irreversible change

        • When a balloon filled with air is pricked, it bursts. The pieces of the balloon cannot be joined to get the complete structure as the one before.
        • A piece of paper cut in the shape of an aeroplane cannot be stuck back together to get the original paper.

    What are some of the factors that cause changes?

    In the above examples, the changes were caused by physical actions like blowing, folding, bursting and cutting. But there are other factors that can also cause changes. Some of them are:

    • Change in temperature
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