Question

state some of the ways of bringing about changes in materials around us.​

Answer 1

Examples: Melting of ice, folding of paper, water turning into vapour, inflation of balloon, etc. When a change cannot be reversed, it is called irreversible change. Examples: Cooking, growth in a living being, burning of paper, etc. When no new substance is formed after the change, it is called physical change.

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Answer 2

Answer:

Some of the ways of bringing about changes in materials are by applying heat, light, electricity, or force.

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Examples of reversible changes are:

• Melting of ice.
• Boiling of water.
• Melting of wax.
• Stretching of a rubber band.
• Stretching of a spring.
• Inflation of a ballon.
• Ironing of clothes.
• Folding of paper.