Question

explain why an egg sinks in fresh water but floats in a strong solution of salt​

Answer 1

$\bold{Explain:}$

Egg sinks in fresh water but floats in a strong solution of salt​.

$\bold{Answer:}$

Density of a strong salt solution is more than the density of fresh water. Hence, the salt solution exerts a greater up-thrust  on the egg which balances the weight of the egg, so the egg floats in  a strong salt solution but sinks in fresh water.