hydrogen is lighter still helium is filled in balloons, why?
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Explanation:
This is because helium is less dense. Because helium is lighter than air, a helium balloon rises. Hydrogen is another gas lighter than air; it is even lighter than helium. ... Helium is a special gas called a Noble Gas, which means it doesn't burn.
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Though Hydrogen is lighter, it has a tendency to burn easily and often catches fire. This is why the noble gas Helium is used in balloons.
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