Breathing by human being
is physical change
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The forces that normally cause changes in volume of the chest and lungs stem not only from ... During ordinary breathing, muscular contraction occurs only on inspiration, expiration being ...
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Breathing is physical process, respiration is a chemical change. Breathing is a chemical process. When air is breathed in, it reacts chemically; when a person breathes out, they release more carbon dioxide than they breathed in, and less oxygen.
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