H2O

Cultural  

1. The chemical symbol (see also symbol) for water. Each molecule of water contains two atoms of hydrogen (H) joined to a single atom of oxygen (O).

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Example Sentences

See Examples For:

H2O

That’s the challenge—and opportunity—facing industrial stocks that specialize in H2O.

From Barron's ● Apr. 16, 2026

Continued heating produces ferric hydroxysulfate, where OH replaces H2O in the mineral structure.

From Science Daily ● Mar. 10, 2026

H2O is the stuff of life, but for several decades, water producers and sommeliers have been working to make it something more: the stuff of taste.

From The Wall Street Journal ● Oct. 20, 2025

Here, at depths of 5km, where no sunlight can penetrate, the oxygen appears to be produced by naturally occurring metallic “nodules” which split seawater - H2O - into hydrogen and oxygen.

From BBC ● Jul. 22, 2024

To indicate the number of atoms in a molecule, Berzelius employed a superscript notation, as in H2O.

From "A Short History of Nearly Everything" by Bill Bryson

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