Physics
Water will not be vapourised if

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

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Physics
What is the principle of a ''Life Jacket"?

It provides oxygen to a drowning person
It increases the volume of the person to keep him afloat
The person can sit on it like a raft
It decreases the volume of the person to keep him afloat

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