2. why helium is used in balloons in place of hydrogen?
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Answer:
Hydrogen is not used in balloons because helium is lighter than air, a helium balloon rises and helium is a special gas called a Noble Gas, which means it doesn't burn.
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Explanation:
hydrogen is more hot and heavy than helium. if hydrogen is filled into a balloon it will burst out on reaching at a height and will heat the air
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