Скачать или смотреть Changes Around Us | Reversible and Irreversible Changes | Chemical Changes | Physical Changes

Every day we come across different types of changes. Turning day into night, night into a day, rising and setting of sun and moon, changing of climate, melting of ice, and lot more. These changes occur in a minute or may take a longer time. Few changes are not even noticeable.

We can bring about a change in a substance by doing one or more of the following processes:

Heating.
Applying force.
Mixing it with something else.
Changes caused by heating: When an object is heated, it gets affected in one or many possible ways.

Some objects get hot but do not change in any other way.
Some objects get hot and also expand in size.
Some objects get hot and begin to bum.
Some objects get hot and change their state.
Changes by applying pressure: When we apply force to an object,

We can change its shape and size.
Air can be compressed.
Metals can be hammered into thin sheets.
Elastic can be stretched.
Cotton can be spun into thin threads.
Changes by mixing a substance with other: We can bring about a change in a substance by mixing it with another. For example, making solution by mixing water soluble substances in water.

Metals expand on heating and contract on cooling.

Chemical changes: These are the changes in which chemical properties of a substance change, and a new substance is formed. For example, cooking of food.

Physical changes: These are the changes in which only physical property of a substance changes and no new substance is formed.

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