To all posters: Please remember that ELI5 is for *explanations* to questions, not just answers.
This means that any response to the OP should detail *why* you can’t just stick hydrogen and oxygen together and get water.
Unfortuately, a shockingly large number of posts have consisted of little more than “hydrogen is hard to get.” This answers a similar question to OP’s, but doesn’t explain the chemistry behind their question. We are a volunteer mod team, and unfortunately, popular posts like this can start to overwhelm us. Please do your part and make sure you check out this part of rule 3 specifically!
> Answers” are not the same thing as “explanations”. An explanation contains more detail. Generally an explanation has 3 components; a context, mechanism, and an impact, while an answer will leave 1 or more of those to be inferred by the reader. This is why very short comments are automatically removed; a user can absolutely ask for an automatic removal to be reviewed.
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