Answers

2016-04-20T13:25:57+05:30
The particles of matter may contracts sometimes or expands sometimes during the changes of matter.
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2016-04-20T21:11:32+05:30
The particles when they are changing from one state to other the energy might liberate or even absorbed. The particles can even lose or gain the mass in a very little way. The particles can even get their characteristic like the arrangement of the molecules, inter molecular spaces etc. will change a lot.  
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