Natural changes are unavoidable. These are vital to our survival. The majority of the objects in our environment are always changing. Changes in day and night, weather, burning of paper, changes in children, and changes in flora are all typical occurrences (germination of seeds, growth, flowering, fruiting, etc.). There is a reason for every change. These factors can create changes in a substance’s shape, size, location, colour, or internal structure. There are two types of changes: reversible and irreversible changes, as well as natural and man-made changes.

Classification of Changes

When certain agents, like heat, light, electricity, force, and so on, are given to a substance, it transforms into a new substance. If the agent is causing the change to be removed, the new substance may change backwards to form the previous compound in rare situations. We also remark that the alteration is reversible or that it can be reversed. We claim that change cannot be reversed or that the changes are irreversible if the new material generated does not undergo reverse change to form the original substance.

Some of the alterations can be reversed in reality, while others are irreversible. As a result, all environmental changes can be classified into two types: reversible and irreversible.

Reversible Change

A reversible change is one that can be reversed or returned to its original substance (form), such as stretching a rubber band, changing the size and shape of a balloon by breathing air into it, water changing into ice on freezing, wax changing into liquid on heating, and so on.

Some Examples of Reversible Changes are:

1. Ice Melting: Once the ice has melted, the water that has been created can be frozen to restore the ice.
2. Returning a paper or fabric to its original form: A paper or cloth can be returned to its original shape.

iii. Rubber band stretching: When we stretch a rubber band with our hands, it changes and its length increases, but when we release the force, the rubber band returns to its original length. This means that the alteration in the rubber band that happened when it was stretched was reversed when it was released. Rubber band stretching is thus a reversible alteration. The extending of spring is a reversible change as well.

1. Coal tar is a black solid substance that is used to repair roads. When heated, coal tar melts into a thick black liquid. Heating causes coal tar to melt, which is a reversible process. This is due to the fact that when hot molten coal tar cools, it solidifies anew.
2. Knitting a sweater, inflating a tire, ironing clothes, boiling water, melting wax or butter, rolling roti dough, heating milk, and so on are all examples of reversible transformations.

Irreversible Change

An irreversible alteration is one that cannot be reversed or returned to its original condition, such as when milk turns into curd, iron turns to rust, paper burns, food is cooked, and so on.

A number of irreversible changes are taking place all around us. This results in the creation of new material, which may or may not be beneficial.

Conclusion

Every day, changes take place all around us. Every change occurs owing to a variety of factors. This modification could be temporary or permanent. Changes in form, shape, size, colour, volume, and other characteristics occur in a variety of ways, such as the transformation of milk into curd or a seedling into a tree. The categories of changes, as well as reversible and irreversible changes and their examples, were covered in this article.