Question

Is really Hydrogen exists in water? ​

Answer 1

Yes,Hydrogen is really exits in water because water(H2O) is mixture of hydrogen and oxygen molecules.

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Answer 2

However, water does have a fairly wide range of temperatures and pressures it can be a liquid in, so it does have a better chance of being a liquid than many other substances. Hydrogen itself exists as a liquid in only the most extreme conditions, so it is extremely rare. Solid hydrogen is even more rare.