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The British chemist Joseph Priestley named the gas inflammable air in 1781, and the French chemist Antoine Laurent Lavoisier renamed it hydrogen
Properties and Occurrence
At ordinary temperatures hydrogen is a colorless, tasteless, and odorless gas, with a density of 0.089 g/liter at 0° C (32° F). It is highly flammable. Like most gaseous elements it is diatomic (its molecules contain two atoms), but it dissociates into free atoms at high temperatures. Hydrogen has a lower boiling point and melting point than any other substance except helium.
Liquid hydrogen, first obtained by the British chemist Sir James Dewar in 1898, is colorless (but light blue in thick layers) with sp...
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