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hydrogen
[ hahy-druh-juhn ]
noun
- a colorless, odorless, flammable gas that combines chemically with oxygen to form water: the lightest of the known elements. : H; : 1.00797; : 1; density: 0.0899 grams/liter at 0°C and 760 millimeters pressure.
hydrogen
/ ˈɪɪə /
noun
- a flammable colourless gas that is the lightest and most abundant element in the universe. It occurs mainly in water and in most organic compounds and is used in the production of ammonia and other chemicals, in the hydrogenation of fats and oils, and in welding. Symbol: H; atomic no: 1; atomic wt: 1.00794; valency: 1; density: 0.08988 kg/m³; melting pt: –259.34°C; boiling pt: –252.87°C See also deuterium tritium
- ( as modifier )
hydrogen bomb
hydrogen
- The lightest and most abundant element in the universe, normally consisting of one proton and one electron. It occurs in water in combination with oxygen, in most organic compounds, and in small amounts in the atmosphere as a gaseous mixture of its three isotopes (protium, deuterium, and tritium) in the colorless, odorless compound H 2 . Hydrogen atoms are relatively electropositive and form hydrogen bonds with electronegative atoms. In the Sun and other stars, the conversion of hydrogen into helium by nuclear fusion produces heat and light. Hydrogen is used to make rocket fuel, synthetic ammonia, and methanol, to hydrogenate fats and oils, and to refine petroleum. The development of physical theories of electron orbitals in hydrogen was important in the development of quantum mechanics. Atomic number 1; atomic weight 1.00794; melting point −259.14°C; boiling point −252.8°C; density at 0°C 0.08987 gram per liter; valence 1.
- See Periodic Table See Note at oxygen
Word History and Origins
Word History and Origins
Origin of hydrogen1
Compare Meanings
How does hydrogen compare to similar and commonly confused words? Explore the most common comparisons:
Example Sentences
The president has taken direct aim at the state’s climate efforts, including moves to block California’s gas car ban, pull funding from its green hydrogen hub, withhold disaster aid, and undermine its cap-and-trade program.
SMRs are just one of several wildly overhyped false promises on which the world is poised to spend hundreds of billions of dollars by 2040, including hydrogen energy and direct air carbon capture.
Residents have also raised concerns about the potential health effects of high levels of hydrogen sulfide and other gases and vapors emanating from the river.
It said jobs could be created in areas like sustainable aviation fuel, hydrogen production and plastics recycling but it would require £3.5bn of private investment.
In comparison, the most environmentally friendly fuels like e-kerosene and ammonia are created from initially splitting water atoms to obtain hydrogen, which is a very energy-intensive and costly process.
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