hydrogen

hydrogène

Élément chimique le plus léger, de symbole H, présent dans l’eau et de nombreuses autres substances.

En anglais simple : The lightest chemical element, with the symbol H, found in water and many other substances.

• Hydrogen is the lightest element.
• Water contains hydrogen and oxygen.
• Scientists study hydrogen in distant stars.

Expressions courantes : hydrogen in water, hydrogen content, hydrogen and oxygen, hydrogen isotope

hydrogène, dihydrogène

Gaz très léger, sans couleur ni odeur, qui brûle facilement et dont la formule est H₂.

En anglais simple : A very light gas with no color or smell that burns easily and has the formula H₂.

• The tank contains hydrogen.
• Hydrogen burns when mixed with oxygen.
• This rocket uses liquid hydrogen as fuel.

Synonymes : hydrogen gas

Expressions courantes : hydrogen gas, hydrogen fuel, liquid hydrogen, tank of hydrogen

atome d'hydrogène

Un seul atome de l’élément chimique le plus léger, dont le symbole est H.

En anglais simple : One atom of the lightest chemical element, whose symbol is H.

• This carbon has one hydrogen attached.
• The reaction replaces a hydrogen with chlorine.
• Both hydrogens are bonded to the same oxygen.

Synonymes : hydrogen atom

Expressions courantes : attached hydrogen, replace a hydrogen, hydrogen on carbon