hydrogen
Pronunciation: [ˈhaɪdrəˌdʒɛn]
Word
Context: "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.
Example
Hydrogen is used in rockets to help them launch into space.
Example
There aren't any hydrogen atoms in pure gold; it's made up of heavier elements.
Example
What would happen if there were no hydrogen in water?
Context: "energy"
(noun) a source of fuel that can be used to create energy. It can run cars and other machines without polluting the air.
Example
Many scientists are researching hydrogen as a clean energy source for the future.
Example
Using hydrogen was not a popular choice in the past compared to oil and gas.
Example
How can hydrogen be used to make energy for our homes?
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