Physics
Water will not be vapourised if

The humidity is 0%
The temperature is 0°C
The temperature is 100°C
The humidity is 100%

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Physics
A hydrogen balloon floats up because of

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

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