Glass is sometimes called a supercooled liquid because it does not form a crystalline structure, but instead forms an amorphous solid that allows molecules in the material to continue to move. However, Scientific America... More »

There are no liquids that do not freeze. However, under certain conditions, it is possible to cool a liquid below its normal freezing point. Such a substance is called a supercooled liquid. More »

Melting point is the temperature at which a solid melts to become a liquid. Since water is already a liquid, it does not have a point at which it liquefies. Frozen water is called ice and has a normal melting point of ze... More »

Amorphous solids are solids which do not have an crystalline structure. There is no particular order to the make up of these types of solids. When viewed under a microscope or when x-rayed, the molecules that make up the... More » Science Chemistry States of Matter

Helium in its solid form has a crystalline structure and sharp melting point. It is the only element that cannot be solidified using low temperatures at ordinary pressures. It changes to solid form when compressed to a p... More » Science Chemistry States of Matter

An amorphous material is one that displays properties of both a solid and a liquid. Mayonnaise is an example of an amorphous substance, since it exhibits liquid properties but the molecules are so arranged that it can wi... More »

A crystalline liquid or solid has a crystal structure composed of a repeating unit cell, which is a particular arrangement of atoms. This repeating unit cell is also called the crystal lattice. More »