what are the changes around us
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There are two types of changes, viz. reversible and irreversible.
reversible change is a change that can be undone or reversed.
Irreversible changes are permanent. They cannot be undone. For example you cannot change a cake back into its ingredients again.
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Reversible Changes Irreversible Changes
That change which can be reversed. Example: Stretching of a rubber band. That change which cannot be reversed. Example: Burning of a candle
Heating is a reversible Change On heating metals expand and on cooling they contract.
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