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What is a change ?

Change is  a continuous process which is an important feature of nature and there is always a reason behind every change .Almost all substances undergo change .But while some changes are easy to detect ,some others are too small to notice .
   The different kinds of changes are slow and fast changes ,natural and man made changes,desirable and undesirable changes .periodic and non periodic changes ,reversible and irreversible changes ,physical and chemical changes ,etc .
Example   :  Freezing of water which  is an example of physical change .


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