RBSE Class 6 Science Notes Chapter 6 Changes Around Us

These comprehensive RBSE Class 6 Science Notes Chapter 6 Changes Around Us will give a brief overview of all the concepts.

RBSE Class 6 Science Chapter 6 Notes Changes Around Us

→ Many changes take place around us at all the time. A change can bring different kinds of effect on the things around us. Some changes take place on their own. For example - A day changes into night and night changes into day, trees grow and flowers blossom, climate changes like summer, winter, monsoon, etc.

→ Some changes are also occurring in our bodies. For example - growing of nails, growing of hair, increase in height with age and increase in weight.

→ A few ways to bring about a change in a substance could be, by heating it or by mixing it with some other substances.

→ Changes around us could be grouped as those that can be reversed or cannot be reversed.

→ Depending on whether a change can be undone or reversed or not reversed, there are two types of changes :

1. Reversible
2. Irreversible.

(1) Reversible Changes: Reversible change is a change in which a product formed can be converted back into its original form, i.e. a change that can be reversed by any means is called a reversible change. For example:
(a) Ice can be melted to form water or water can be frozen to form- ice.
(b) Folded paper can be unfold.
(c) Water changes to vapour or vapour changes to water.

(2) Irreversible Changes: Irreversible change is a change in which a product formed cannot be converted back into its original form, i.e. a change that cannot be reversed by any means is called an irreversible change. For example:
(a) When we burn a sheet of paper it changes into ash and smoke. Ash and smoke cannot be converted into paper again.
(b) A potter shapes a lump of clay into a pot followed by baking the pot in an oven. This pot cannot be changed into clay again.
(c) Cooked food cannot be uncooked again.
(d) Growth in height of a living being cannot be decreased again.
(e) Melting of candle wax.