Physics
The average kinetic energy of the molecules of an ideal gas is directly proportional to

Velocity of Molecules
Temperature of environment
Absolute temperature of the gas
Mass of Molecules

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Physics
A hydrogen balloon floats up because of

Air pressure decreases with decrease in height
The pressure inside the balloon is more than the pressure outside it
Weight of the balloon is less than the weight of air displaced by it.
Air pressure decreases with decrease in weight

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