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Retrieved 11 March 2008.
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In addition, liquid hydrogen is a and presents dangers such as associated with very cold liquids.
Hydrogen can be burned to produce heat or combined with oxygen in to generate electricity directly, with water being the only emissions at the point of usage.
Principles of Modern Chemistry 5th ed.
Retrieved 25 December 2021.
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Most of the mass of the universe, however, is not in the form of chemical-element type matter, but rather is postulated to occur as yet-undetected forms of mass such as and.
Hydrogen gas is very rare in the Earth's atmosphere 1 by volume because of its light weight, which enables it to more rapidly than heavier gases.