Physics
Buoyancy depends on

The shaped of the body
The mass of the body
The depth to which the body is immersed
The mass of the liquid displaced

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

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

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