hydrogen

[ hahy-druh-juhn ]

/ ˈhaɪ drə dʒən /

noun

a colorless, odorless, flammable gas that combines chemically with oxygen to form water: the lightest of the known elements.Symbol: H; atomic weight: 1.00797; atomic number: 1; density: 0.0899 grams/liter at 0°C and 760 millimeters pressure.

Origin of hydrogen

First recorded in 1785–95; from the French word hydrogène; see hydro-¹, -gen

Words nearby hydrogen

hydroforming, hydroformylation, hydrofracking, hydrofracturing, hydrogel, hydrogen, hydrogen-1, hydrogen-2, hydrogen-3, hydrogenase, hydrogenate

Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for hydrogen

From that, they extracted the ratio of the number of deuterium atoms to the number of hydrogen atoms.
Are Comets the Origin of Earth’s Oceans?|Matthew R. Francis|December 14, 2014|DAILY BEAST
They found that there are roughly 1,900 hydrogen atoms for each deuterium atom in the water on Comet 67P.
Are Comets the Origin of Earth’s Oceans?|Matthew R. Francis|December 14, 2014|DAILY BEAST
Deuterium is an isotope of hydrogen containing a proton and neutron in its nucleus, while normal hydrogen has only a proton.
Are Comets the Origin of Earth’s Oceans?|Matthew R. Francis|December 14, 2014|DAILY BEAST
Jupiter and its cousins, by contrast, are mostly made of hydrogen and hydrogen compounds.
Mega-Earth Is the Weirdest Exoplanet Yet|Matthew R. Francis|June 8, 2014|DAILY BEAST

Most of the atoms in a newborn star system are hydrogen, which is the lightest chemical element.
Mega-Earth Is the Weirdest Exoplanet Yet|Matthew R. Francis|June 8, 2014|DAILY BEAST
Thus hydrogen potassium or hydrogen sodium can be obtained, as will be seen by the following description.
Scientific American Supplement, No. 433, April 19, 1884|Various
Carbon, hydrogen, oxygen and nitrogen are all lifeless bodies.
Lay Sermons, Addresses and Reviews|Thomas Henry Huxley
The mass of each particle is, according to the latest and finest measurements 1/1845 of that of an atom of hydrogen.
The Outline of Science, Vol. 1 (of 4)|J. Arthur Thomson
Chlorine has a powerful affinity for bases of all kinds, particularly metallic bases and hydrogen.
A System of Logic: Ratiocinative and Inductive|John Stuart Mill
In Fig. 12, why is it necessary to dry the hydrogen by means of the calcium chloride in the tube X?
An Elementary Study of Chemistry|William McPherson

British Dictionary definitions for hydrogen

hydrogen

/ (ˈhaɪdrɪdʒən) /

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°CSee also deuterium, tritium
(as modifier)hydrogen bomb

Word Origin for hydrogen

C18: from French hydrogène, from hydro- + -gen; so called because its combustion produces water

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Cultural definitions for hydrogen

hydrogen

The lightest chemical element; its symbol is H. Hydrogen normally consists of a single electron in orbit around a nucleus made up of a single proton. It is usually found as a gas and has several uses as a fuel.

notes for hydrogen

Hydrogen atoms are combined to form helium atoms in fusion reactions in stars and in hydrogen bombs, which release huge amounts of energy. Hydrogen also burns rapidly, producing water as it combines with oxygen (see H2O and oxidation).

notes for hydrogen

For a time, hydrogen was frequently used to fill blimps and dirigibles because of its extremely low weight. In 1937, however, the hydrogen in the dirigible Hindenburg caught fire, and many of the passengers and crew were killed. Since that time, helium has been widely preferred to hydrogen for use in airships; it is not as buoyant (see buoyancy) or cheap as hydrogen, but, being an inert gas, it does not burn.

notes for hydrogen

Because there is so much hydrogen in stars, it is by far the most abundant element in the universe.

Medical definitions for hydrogen

hydrogen

[ hī′drə-jən ]

n. Symbol H

A colorless, highly flammable gaseous element, the most abundant in the universe, used in ammonia and methanol synthesis, in the hydrogenation of organic materials, and as a reducing atmosphere. Atomic number 1.

Scientific definitions for hydrogen

hydrogen

[ hī′drə-jən ]

H

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 H2. 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.

单词	hydrogen
释义	hydrogen [ hahy-druh-juhn ] / ˈhaɪ drə dʒən / noun a colorless, odorless, flammable gas that combines chemically with oxygen to form water: the lightest of the known elements.Symbol: H; atomic weight: 1.00797; atomic number: 1; density: 0.0899 grams/liter at 0°C and 760 millimeters pressure. Origin of hydrogen First recorded in 1785–95; from the French word hydrogène; see hydro-¹, -gen Words nearby hydrogen hydroforming, hydroformylation, hydrofracking, hydrofracturing, hydrogel, hydrogen, hydrogen-1, hydrogen-2, hydrogen-3, hydrogenase, hydrogenate Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 Example sentences from the Web for hydrogen From that, they extracted the ratio of the number of deuterium atoms to the number of hydrogen atoms. Are Comets the Origin of Earth’s Oceans?\|Matthew R. Francis\|December 14, 2014\|DAILY BEAST They found that there are roughly 1,900 hydrogen atoms for each deuterium atom in the water on Comet 67P. Are Comets the Origin of Earth’s Oceans?\|Matthew R. Francis\|December 14, 2014\|DAILY BEAST Deuterium is an isotope of hydrogen containing a proton and neutron in its nucleus, while normal hydrogen has only a proton. Are Comets the Origin of Earth’s Oceans?\|Matthew R. Francis\|December 14, 2014\|DAILY BEAST Jupiter and its cousins, by contrast, are mostly made of hydrogen and hydrogen compounds. Mega-Earth Is the Weirdest Exoplanet Yet\|Matthew R. Francis\|June 8, 2014\|DAILY BEAST Most of the atoms in a newborn star system are hydrogen, which is the lightest chemical element. Mega-Earth Is the Weirdest Exoplanet Yet\|Matthew R. Francis\|June 8, 2014\|DAILY BEAST Thus hydrogen potassium or hydrogen sodium can be obtained, as will be seen by the following description. Scientific American Supplement, No. 433, April 19, 1884\|Various Carbon, hydrogen, oxygen and nitrogen are all lifeless bodies. Lay Sermons, Addresses and Reviews\|Thomas Henry Huxley The mass of each particle is, according to the latest and finest measurements 1/1845 of that of an atom of hydrogen. The Outline of Science, Vol. 1 (of 4)\|J. Arthur Thomson Chlorine has a powerful affinity for bases of all kinds, particularly metallic bases and hydrogen. A System of Logic: Ratiocinative and Inductive\|John Stuart Mill In Fig. 12, why is it necessary to dry the hydrogen by means of the calcium chloride in the tube X? An Elementary Study of Chemistry\|William McPherson British Dictionary definitions for hydrogen hydrogen / (ˈhaɪdrɪdʒən) / 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°CSee also deuterium, tritium (as modifier)hydrogen bomb Word Origin for hydrogen C18: from French hydrogène, from hydro- + -gen; so called because its combustion produces water Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012 Cultural definitions for hydrogen hydrogen The lightest chemical element; its symbol is H. Hydrogen normally consists of a single electron in orbit around a nucleus made up of a single proton. It is usually found as a gas and has several uses as a fuel. notes for hydrogen Hydrogen atoms are combined to form helium atoms in fusion reactions in stars and in hydrogen bombs, which release huge amounts of energy. Hydrogen also burns rapidly, producing water as it combines with oxygen (see H2O and oxidation). notes for hydrogen For a time, hydrogen was frequently used to fill blimps and dirigibles because of its extremely low weight. In 1937, however, the hydrogen in the dirigible Hindenburg caught fire, and many of the passengers and crew were killed. Since that time, helium has been widely preferred to hydrogen for use in airships; it is not as buoyant (see buoyancy) or cheap as hydrogen, but, being an inert gas, it does not burn. notes for hydrogen Because there is so much hydrogen in stars, it is by far the most abundant element in the universe. The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved. Medical definitions for hydrogen hydrogen [ hī′drə-jən ] n. Symbol H A colorless, highly flammable gaseous element, the most abundant in the universe, used in ammonia and methanol synthesis, in the hydrogenation of organic materials, and as a reducing atmosphere. Atomic number 1. The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company. Scientific definitions for hydrogen hydrogen [ hī′drə-jən ] H 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 H2. 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. The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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