Physics
Due to temperature variation along a conductor, potential variation occurs along it. This phenomenon is known as

Joule effect
Thomson effect
Seebeck effect
Peltier effect

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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
Albumin dissolves in salt solution and egg becomes lighter
Egg absorbs salt from the solution and expands

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