Changes like the ripening
of a fruit, spoiling of milk occur naturally. These are called natural changes. Can
you think of other examples of such natural changes ?
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Physical changes are the changes only in the physical properties of a substance is often reversible. Chemical changes bring about a change in the chemical composition of a substance and in most cases are irreversible. An example of a physical change is the change in the state of water from ice to liquid water to steam.
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