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he·li·um
 helium
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- pronunciation:
- hi
li
 m
- features:
- Word Explorer
| part of speech: |
noun |
| definition: |
Helium is a gas that is one of the chemical elements. If you fill a balloon with helium, it will rise through the air because helium is lighter in weight than air. The chemical symbol is He.
The balloons at the party were filled with helium. They were all floating up at the ceiling. |
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