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There are so many uses of hydrogen , not only it's H2 form but also when it makes compounds with other elements like water, a hydride of oxygen. It is also used as fuel.
The most abundant element in the universe, hydrogen is also a promising source of "clean" fuel on Earth. ... Pure hydrogen gas is scarce in Earth's atmosphere and any hydrogen that actually enters the atmosphere rapidly escapes Earth's gravity, according to the Royal Society.
The most abundant element in the universe, hydrogen is also a promising source of "clean" fuel on Earth. ... Pure hydrogen gas is scarce in Earth's atmosphere and any hydrogen that actually enters the atmosphere rapidly escapes Earth's gravity, according to the Royal Society