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mention two irreversible physical changes explain why those changes are physical even though they are irreversible

Dear student ,

Kindly refer to the similar links :

https://www.meritnation.com/ask-answer/question/is-cutting-of-trees-a-physical-change-experts-i-went-throu/chemical-reactions-and-equations/10223173

https://www.meritnation.com/ask-answer/question/is-there-any-irreversable-physical-change/physical-and-chemical-changes/1059424

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the  examples of irreversible changes can be 
1) cutting of paper .... because it can be joined again and form a paper 
2) folding of a cloth ..... because after we again open it ; it will again be in its original size as well as shape 

so thats why we call these 2 changes irreversible changes
 
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