Why doesn't water, composed of oxygen and hydrogen, burn or explode?

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Let's remember the water molecule H2O, which contains a hydrogen atom and two oxygen atoms. As we know, oxygen is the element necessary for combustion, while hydrogen is famous for the most powerful bombs. Nevertheless, water not only does not burn and cannot explode, but it is also absolutely safe for humans (which, in fact, is 80% water itself).

In order to understand why water neither burns nor explodes, it is necessary to refresh your memory on how combustion occurs. Chemically speaking, combustion is the process of oxidation (the interaction of a substance with oxygen) with the release of large amounts of heat.

We can see from the chemical formula of water H2O that it is already the result of combustion (oxidation), because the hydrogen in its molecule has reacted with oxygen. During this reaction a lot of energy is released, which leads to a lot of heat and sometimes even a thermal explosion. Therefore, the water formed during the hydrogen oxidation process has already given up the energy of hydrogen combustion and can no longer burn. Nevertheless, if water is decomposed into oxygen and hydrogen again by electrolysis, they can individually burn again and explode.

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