Question

why does the cut surface of bring turn brown on exposure to air for some time ​

Answer 1

Answer:

When fresh fruits and vegetables are peeled or cut open, the enzyme called polyphenol oxidase (also called tyrosinase) contained in the cells is exposed to and reacts with the oxygen in the air. The reaction that occurs, which is called oxidation, is what turns the fruits and vegetables brown

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Answer 2

Because the blood when comes in contact with the pressure of air and helium kind of gases it our brain gets the signal to our body to stop the blood pressure there fore it’s said to put your hand ( our the part of the body you have got an wound on ) under running tap water to make our brain get the signal faster