Why helium is used in balloons instead of hydrogen
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Helium is used in balloons instead of hydrogen because helium is a very light gas and it helps the balloon to rise.
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Because helium is lighter than air, a helium balloon rises. Hydrogen is another gas lighter than air; it is even lighter than helium. Hydrogen is not used in balloons and this demonstration shows why. Helium is a special gas called a Noble Gas, which means it doesn't burn
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