What are the only two liquids that violate the principle of greater density at temperatures near their freezing points?

Question

Quizplus · Accepted Answer

Ammonia and water are the only two liquids that violate the principle of greater density at temperatures near their freezing points. This is because the hydrogen bonding in these molecules causes them to expand as they freeze, resulting in a decrease in density.

What Are the Only Two Liquids That Violate the Principle