GENERAL HISTOLOGY

Detailed explanation-1: -Believe it or not, ice is actually about 9% less dense than water. Since the water is heavier, it displaces the lighter ice, causing the ice to float to the top.

Detailed explanation-2: -The solid states of other liquids are denser because the molecules pack together tightly when the kinetic energy (temperature) decreases. The hydrogen bonds in water ice are indeed strong, but their orientation causes molecules to push apart, actually lowering density.

Detailed explanation-3: -The gaps between ice molecules are greater than those between water molecules. As a result, ice has a lower density than water. Since ice has a lower density than liquid water it floats on water.

Detailed explanation-4: -Ice is less dense than water because when water freezes the molecules assemble into a tetrahedral crystalline structure that push the water molecules farther apart due to hydrogen bonding. As the water molecules are pushed apart into the crystal lattice, there is more space in between them.