Question

bleeding stops by rubbing alum, why?​

Answer 1

Answer:

Moist alum is a coagulating agent. Whenever it is rubbed on the site of blood bleeding, it causes coagulation of the blood that stops bleeding. Bleeding is stopped by the coagulation of the blood, that is clot formation. This coagulation is due to colloidal solution of protein in blood.

Explanation:

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Answer 2

Moist alum is a coagulating agent .Whenever it is rubbed on the site of bleeding it causes coagulation blood ,that stops bleeding .

Thus bleeding stop by rubbing alum