English Dictionary

hydrogen

/ˈhaɪdɹədʒ(ə)n/

noun

The lightest chemical element (symbol H), with an atomic number of 1 and atomic weight of 1.00794. / Molecular hydrogen (H₂), a colourless, odourless and flammable gas at room temperature.

Hydrogen is used as a fuel in some vehicles.

意味（1）

The lightest chemical element (symbol H), with an atomic number of 1 and atomic weight of 1.00794.

For quotations using this term, see Citations:hydrogen.

意味（2）

Molecular hydrogen (H₂), a colourless, odourless and flammable gas at room temperature.

意味（3）

An atom of the element.

意味（4）

A sample of the element.