Hydrogen is a colourless gas that is the lightest and commonest element in the universe.
hydrogen in British English
(ˈhaɪdrɪdʒən)
noun
a.
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
b.
(as modifier)
hydrogen bomb
Word origin
C18: from French hydrogène, from hydro- + -gen; so called because its combustion produces water
hydrogen in American English
(ˈhaɪdrədʒən)
noun
a flammable, colorless, odorless, gaseous chemical element, the lightest of all known substances: symbol, H; at. no., 1
Derived forms
hydrogenous (hyˈdrogenous) (haɪˈdrɑdʒənəs)
adjective
Word origin
Fr hydrogène (see hydro- & -gen): coined (1787) by L. B. Guyton de Morveau (1737-1816), Fr chemist, in referenceto the generation of water from the combustion of hydrogen
Examples of 'hydrogen' in a sentence
hydrogen
This burns the waste to ash and releases highly flammable carbon monoxide and hydrogen gases.
Times, Sunday Times (2013)
They are all hydrogen and carbon based.
Radford, Tim & Leggett, Jeremy The Crisis of Life on Earth - our legacy from the second millenium (1990)
The technique works by reacting carbon dioxide with hydrogen.
Times, Sunday Times (2012)
The apparatus was kept in hydrogen gas that leaked.
Times, Sunday Times (2015)
What is the difference between a hydrogen bomb and an atomic bomb?
Times, Sunday Times (2016)
Now it is also a nuclear power and this week carried out tests on a supposed hydrogen bomb.
The Sun (2016)
These minerals are required in tiny amounts compared to carbon, hydrogen and oxygen.
Holford, Patrick The Family Nutrition Workbook (1988)
This means more ozone around us; more hydrogen peroxide.
Radford, Tim & Leggett, Jeremy The Crisis of Life on Earth - our legacy from the second millenium (1990)
Since then hydrogen peroxide has been made much more difficult to obtain in Britain.
Times, Sunday Times (2007)
It's seamless going from gas to hydrogen.
Times, Sunday Times (2008)
The pH of a solution is a measure of its hydrogen ion concentration and hence of its acidity.
Mayes, Adrienne The Dictionary of Nutritional Health (1986)
A hydrogen bomb can be hundreds of times more powerful than an atomic bomb.
Times, Sunday Times (2016)
Fourth, the production of hydrogen is not exactly carbon-neutral.
Times, Sunday Times (2013)
Visiting the factory in January, the current leader claimed to have successfully tested a hydrogen bomb.
Times, Sunday Times (2016)
It was, he said, to be a hydrogen bomb.
Times, Sunday Times (2016)
That volcanic energy erupted about 20 or 30 years ago when he discovered that there existed a hydrogen bomb capable of destroying mankind.
Times, Sunday Times (2008)
In human mitochondria, it takes ten hydrogen ions to crank the protein through a full circle and thus produce three molecules of ATP.
Oliver Morton Eating the Sun: How Plants Power the Planet (2007)
Word lists with
hydrogen
chemical, Types of gas
In other languages
hydrogen
British English: hydrogen /ˈhaɪdrɪdʒən/ NOUN
Hydrogen is a colourless gas that is very light.
American English: hydrogen
Arabic: هَيْدْرُوجِيـنٌ
Brazilian Portuguese: hidrogênio
Chinese: 氢
Croatian: hidrogen
Czech: vodík
Danish: brint
Dutch: waterstof
European Spanish: hidrógeno
Finnish: vety
French: hydrogène
German: Wasserstoff
Greek: υδρογόνο
Italian: idrogeno
Japanese: 水素
Korean: 수소 화학
Norwegian: hydrogen
Polish: wodór
European Portuguese: hidrogénio
Romanian: hidrogen
Russian: водород
Latin American Spanish: hidrógeno
Swedish: väte
Thai: ก๊าซไฮโดรเจน
Turkish: hidrojen
Ukrainian: водень
Vietnamese: khí hydro
All related terms of 'hydrogen'
hydrogen bomb
A hydrogen bomb is a nuclear bomb in which energy is released from hydrogen atoms .
hydrogen bond
a weak chemical bond between an electronegative atom , such as fluorine , oxygen , or nitrogen , and a hydrogen atom bound to another electronegative atom. Hydrogen bonds are responsible for the properties of water and many biological molecules
hydrogen ion
an ionized hydrogen atom , occurring in plasmas and in aqueous solutions of acids, in which it is solvated by one or more water molecules ; proton . Formula: H +
heavy hydrogen
→ deuterium
hydrogen iodide
a colourless poisonous corrosive gas obtained by a catalysed reaction between hydrogen and iodine vapour : used in making iodides . Formula: HI
hydrogen bromide
a colourless pungent gas used in organic synthesis . Formula: HBr
hydrogen carbonate
a salt of carbonic acid containing the ion HCO 3 – ; an acid carbonate
hydrogen chloride
a colourless pungent corrosive gas obtained by the action of sulphuric acid on sodium chloride : used in making vinyl chloride and other organic chemicals . Formula: HCl
hydrogen cyanide
a colourless poisonous liquid with a faint odour of bitter almonds , usually made by a catalysed reaction between ammonia , oxygen , and methane . It forms prussic acid in aqueous solution and is used for making plastics and dyes and as a war gas. Formula: HCN
hydrogen fluoride
a colourless poisonous corrosive gas or liquid made by reaction between calcium fluoride and sulphuric acid: used as a fluorinating agent and catalyst . Formula: HF
hydrogen peroxide
Hydrogen peroxide is a chemical that is often used to make hair lighter or to kill germs .
hydrogen sulfide
a flammable , poisonous gas, H 2 S, with the characteristic odor of rotten eggs, widely used as a reagent in analytical chemistry
hydrogen sulphate
a salt or ester of sulphuric acid containing the monovalent group -HSO 4 or the ion HSO 4 –
hydrogen sulphide
a colourless poisonous soluble flammable gas with an odour of rotten eggs : used as a reagent in chemical analysis . Formula: H 2 S
hydrogen sulphite
a salt or ester of sulphurous acid containing the monovalent group -HSO 3 or the ion HSO 3 –
hydrogen tartrate
(not in technical usage ) a salt or ester of tartaric acid containing the monovalent group -HC 4 H 4 O 6 or the ion HC 4 H 4 O 6 –
hydrogen embrittlement
the weakening of metal by the sorption of hydrogen during a pickling process, such as that used in plating
sulphuretted hydrogen
a colourless poisonous soluble flammable gas with an odour of rotten eggs: used as a reagent in chemical analysis . Formula: H 2 S
hydrogen sulfide scrubber
A hydrogen sulfide scrubber is a device for the chemical removal of hydrogen sulfide.
potassium hydrogen tartrate
a colourless or white soluble crystalline salt used in baking powders , soldering fluxes , and laxatives . Formula: KHC 4 H 4 O 6
bitartrate
(not in technical usage ) a salt or ester of tartaric acid containing the monovalent group -HC 4 H 4 O 6 or the ion HC 4 H 4 O 6 –
hydrosulphide
any salt derived from hydrogen sulphide by replacing one of its hydrogen atoms with a metal atom
bicarbonate
a salt of carbonic acid containing the ion HCO 3 – ; an acid carbonate