Hydrogen peroxide (H₂O₂) foams when it comes into contact with a wound due to an enzyme called catalase, which is present in blood and most living cells. Catalase breaks down hydrogen peroxide into water (H₂O) and oxygen (O₂). The rapid release of oxygen gas forms bubbles, creating the foaming effect. This reaction helps to clean the wound by killing bacteria and removing debris, though it can also damage healthy cells, which is why it’s not always recommended for wound care.
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