Have you ever observed a balloon seller filling a large number of balloons from a single cylinder of gas? Enquire from him how many balloons is he able to fill from one cylinder. Ask him which gas does he have in the cylinder.
NCERT Class 9th Science Ch 1 Matter in Our Surroundings
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The cylinder has the gas helium.
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The gas is Helium.
Explanation:
The number of balloons that the balloon seller can fill using the gas cylinder is based on the size of the cylinder and the size of the individual balloons. The gas with which the balloons are usually filled is helium.
Because it lighter than normal air so it has the tendency to fly high when the balloon is left free. Most of the children who are all buying these balloons do not know what the gas it holds is. They simply call it as gas balloon.
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