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

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

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Physics
Why two thin shirts can keep us warmer than a single thick shirt in winter ?

Air layer between two shirts works as good conductor
No radiation of heat takes place
Two thin shirts become thicker so prevent transmission of heat
Air layer between two shirts behaves like insulating media

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