Physics
An egg sinks in soft water but floats in a concentrated solution of salt because

Albumin dissolves in salt solution and egg becomes lighter
Water has high surface tension
Egg absorbs salt from the solution and expands
The density of salt solution exceeds the density of eggs

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

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

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