hydrogen
The lightest chemical element (symbol H), with an atomic number of 1 and atomic weight of 1.008.
Example
“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.”
Other meanings
An atom of this element.
Molecular hydrogen ('; symbol H2), a colourless, odourless and flammable gas at room temperature.
“A large tank of hydrogen constituted most of the bulk of that rocket.”
A kind of
- chemical element
- gas
Kinds of hydrogen
- tritium
Example sentences
Word history
From French "hydrogène".
Where this comes from
This definition is adapted from “hydrogen” on Wiktionary, by its contributors; example sentences are from Tatoeba, credited to their authors above; related-word lists use Open English WordNet (CC BY 4.0, based on Princeton WordNet), published under CC BY-SA 4.0. This page is published under the same licence.