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2015-01-31T00:30:34+05:30

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Changes which can be reversed are called reversible changes or physical change. 
example : by heating water, it becomes vapour and it can become water again after cooling.

Changes in which the chemical compositions of a substance changes are the irreversible changes. 
example: when an egg is heated, the yolk and albumin solidifies; it can't be reversed.
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