hydrogen
Prononciation : [ˈhaɪdrəˌdʒɛn]
Mot
Contexte : « science »
(noun) a chemical element that is the simplest and lightest. It is a gas that you can't see or smell, and it is important for making water and other things.
Exemple
Hydrogen is used in rockets to help them launch into space.
Exemple
There aren't any hydrogen atoms in pure gold; it's made up of heavier elements.
Exemple
What would happen if there were no hydrogen in water?
Contexte : « energy »
(noun) a source of fuel that can be used to create energy. It can run cars and other machines without polluting the air.
Exemple
Many scientists are researching hydrogen as a clean energy source for the future.
Exemple
Using hydrogen was not a popular choice in the past compared to oil and gas.
Exemple
How can hydrogen be used to make energy for our homes?
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