With the exception of ice floating in water,what is the only other substance that is less dense as a solid and floats in its liquid?

Question

Quizplus · Accepted Answer

Ammonia is the only other substance listed that is less dense as a solid than as a liquid, allowing solid ammonia to float in its liquid form, similar to how ice floats in water. This property is due to the hydrogen bonding and molecular structure of ammonia when it solidifies.

With the Exception of Ice Floating in Water,what Is the Only