Meaning

(uncountable) The lightest chemical element (symbol H), with an atomic number of 1 and atomic weight of 1.008..

Definitions by Sense

1. (uncountable) The lightest chemical element (symbol H), with an atomic number of 1 and atomic weight of 1.008.
2. (uncountable) Molecular hydrogen (sense 1; symbol H₂), a colourless, odourless and flammable gas at room temperature.
3. (uncountable) Synonym of protium (“the lightest and most common isotope of hydrogen (sense 1; symbol H, ¹H, or 11H), as contrasted with deuterium and tritium”).

Example Sentences

Our professor then reminded us that a hydrogen ion is merely a proton, and thus we should think about acid-base theory as we consider this problem further.

The ignis fatuus or Jack a lantern, ſo frequently alluded to by poets, is ſuppoſed to originate from the inflammable air, or Hydrogene, given up from moraſſes; […]

But my Leech—a leech / Fit to suck blood, with lubricous round rings, / Capaciously expatiative, which make / His little body like a red balloon, / As full of blood as that of hydrogen, / Sucked from men's hearts; […]

Water is the sole product of the combustion of hydrogen gas. For this important fact we are indebted to Mr. [Henry] Cavendish. He demonstrated it by burning oxygen and hydrogen gases in a dry glass vessel, when a quantity of pure water was generated exactly equal in weight to that of the gases which had disappeared.

It was an enormous balloon filled with helium, that elemental gas forged from hydrogen in the nuclear furnace of the stars, first step along the way in the generation of multiplicity and variety of matter in the universe, including our selves and all our thoughts.

A large tank of hydrogen constituted most of the bulk of that rocket.

[Jacques] Charles was the first to send up a hydrogen balloon, 12 feet in diameter, which rose 3,123 feet, disappeared in the clouds, and fell at the distance of 15 miles.

As the tension between the Soviets and the United States increased from 1948 to 1950, the administration took a number of actions that [George Frost] Kennan felt narrowed the possibilities for constructive negotiations between the two nations. These actions included the decisions to build the hydrogen bomb, to maintain American troops in Japan after the formal occupation was over, to create an independent West German state, and to form the North Atlantic Treaty Organization (NATO).

Word Forms

• hydrogens

Synonyms for hydrogen

Related Words

When Should You Use Hydrogen?

Use hydrogen when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.

Practice This Word

Frequently Asked Questions