hydrogen

The word “hydrogen” means the lightest chemical element, with the symbol H and atomic number 1. In plain terms, the simplest and lightest element there is, and the main ingredient (along with oxygen) of water.

“Hydrogen” is pronounced HYD-ruhjn (/ˈhaɪdɹəd͡ʒ(ə)n/ in IPA).

Here is “hydrogen” used in a sentence: “Hydrogen and oxygen combine to form water.”

Words with a similar meaning to “hydrogen” include element 1, hydrogen air, hydrogen gas, hydrogenium, inflammable air and waterstuff.

“Hydrogen” is a noun.

The word “hydrogen” comes from French. Coined in French by chemists Guyton de Morveau and Lavoisier from Greek hydro- ("water") plus -gene ("producer of"), because burning hydrogen produces water.

“Hydrogen” is a fairly common word in modern English.

“Hydrogen” has 2 distinct senses listed in this dictionary. The most common is: the lightest chemical element, with the symbol H and atomic number 1.

Hydrogen is the lightest chemical element, with the symbol H and atomic number 1, and its gas is highly flammable. Helium is the second-lightest element, with atomic number 2, and it does not burn at all, which is why helium rather than hydrogen is used in party balloons and modern airships.

Yes. At room temperature hydrogen is a colourless, odourless gas made of molecules that each contain two hydrogen atoms, written H2. It only becomes a liquid at extremely low temperatures.

Hydrogen gas is highly flammable and ignites easily when mixed with air. Because it is also colourless and odourless, a leak is difficult to detect, so the gas has to be stored and handled with care.

The H in H2O stands for hydrogen, and the 2 shows that each water molecule contains two hydrogen atoms bonded to one oxygen atom, the O. Hydrogen's chemical symbol is simply the capital letter H.