Eli5 Why does hydrogen peroxide bubble?

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And how does it clean open wounds? Hope effective is it compared to rubbing alcohol and why would I use one over the other?

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Hydrogen peroxide bubbles because it’s mostly water with a very reactive chemical inside (the H202)

When H2O2 encounters most things it’s happy to lose that ‘extra’ oxygen, creating compounds that are often gasses (making those bubbles) and water in the process.

It kills bacteria and can destroy viruses by breaking the chemicals that make them up, as the oxygen bonds with them to make new compounds. Oxidation/bleaching like this is bad for living things (you are protected by being covered by layers of un-alive skin).

Hydrogen peroxide solution is about as effective a topical antiseptic as alcohol solutions, and used much the same way. Hydrogen peroxide can be better for some sensitive tissues.

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