[Solved] A hydrogen balloon floats because of –

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Q.	A hydrogen balloon floats because of –
A.	Air pressure decreases with decrease in height
B.	Air pressure decreases with decrease in weight
C.	Weight of the balloon is less than the weight of air displaced by it
D.	The pressure inside the balloon is more than the pressure outside it
Answer» C. Weight of the balloon is less than the weight of air displaced by it
Explanation: A hydrogen atom is very light. Most of the air on earth is made up of nitrogen, oxygen, and carbon dioxide. All of these elements are heavier than hydrogen, so the balloon is pushed upwards. Hydrogen weighs 0.08988 grams per liter. Nitrogen, which makes up 80% of the air we breathe, weighs 1.2506 grams per liter.

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