which gas is present in the air balloons?
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helium is the gas present in the air balloons because it is a lightest gas and when it is filled in balloons then they fly high up in the sky.
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Helium gas has a lifting force of around one gram per liter, so are used in air balloons.If your weight is suppose 5000 grams (50 kg),you can lift in air with a balloon containing 5000 litres of helium.
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