Why Does Water Expands when Frozen?
by Owen Borville
7.21.2024
Physics, Chemistry
Water expands when it freezes due to the unique properties of its molecules.
Water molecules are made up of two hydrogen atoms and one oxygen atom, forming a “V” shape in its molecular structure. This shape causes the molecules to form hydrogen bonds with each other.
In liquid water, these hydrogen bonds are constantly forming and breaking, allowing the molecules to move closer together. However, when water freezes, the molecules arrange themselves into a crystalline structure that maximizes the hydrogen bonds.
This structure is less dense than liquid water because it creates an open hexagonal lattice with more space between the molecules. As a result, the overall volume increases, causing water to expand when it freezes.
This expansion of water freezing into ice is why ice floats on water and why frozen water can cause pipes to burst.
However, water is not the only liquid that expands when frozen.
Iron also expands when frozen, and this phenomenon explains why iron can be cast. Elements antimony, bismuth, cerium, gallium, germanium, plutonium, and silicon also expand when frozen.
by Owen Borville
7.21.2024
Physics, Chemistry
Water expands when it freezes due to the unique properties of its molecules.
Water molecules are made up of two hydrogen atoms and one oxygen atom, forming a “V” shape in its molecular structure. This shape causes the molecules to form hydrogen bonds with each other.
In liquid water, these hydrogen bonds are constantly forming and breaking, allowing the molecules to move closer together. However, when water freezes, the molecules arrange themselves into a crystalline structure that maximizes the hydrogen bonds.
This structure is less dense than liquid water because it creates an open hexagonal lattice with more space between the molecules. As a result, the overall volume increases, causing water to expand when it freezes.
This expansion of water freezing into ice is why ice floats on water and why frozen water can cause pipes to burst.
However, water is not the only liquid that expands when frozen.
Iron also expands when frozen, and this phenomenon explains why iron can be cast. Elements antimony, bismuth, cerium, gallium, germanium, plutonium, and silicon also expand when frozen.