An iron nail sinks in water but it floats in mercury. Why ?

A nail sinks in water whereas it floats on mercury.

Expain why, a piece of glass sinks in water but it floats in mercury.

Give scientific reason : A piece of iron sinks in water but floats on mercury.

A piece of nail sinks in water but a boat floats in it because

Steel sinks in water but a steel boat floats .why ?

Why an iron needle sinks in water, but an iron ship floats in water?

Give scientific reason : An iron nail sinks in water but a ship made from iron floats on water.

A piece of iron (specific gravity = 7.8) sinks in water, but floats on mercury (specific gravity = 13.6) - explain why.

Iron nail sinks in water. Empty iron tin box floats on water. why?