In materials science polyamorphism is the ability of a substance to exist in several different amorphous modifications. Materials Science or Materials Engineering is an interdisciplinary field involving the properties of matter and its applications to various areas of Science and An amorphous solid is a Solid in which there is no Long-range order of the positions of the Atoms (Solids in which there is long-range atomic order are It is analogous to the polymorphism of crystalline materials. Polymorphism in Materials science is the ability of a solid material to exist in more than one form or Crystal structure In Materials science, a crystal is a Solid in which the constituent Atoms Molecules or Ions are packed in a regularly ordered repeating Even though amorphous materials exhibit no long-range periodic atomic structure, different phases can vary in other properties, such as the density. In Physics, long-range order characterizes physical Systems in which remote portions of the same sample exhibit correlated behavior History See also Atomic theory, Atomism The concept that matter is composed of discrete units and cannot be divided into arbitrarily tiny The density of a material is defined as its Mass per unit Volume: \rho = \frac{m}{V} Different materials usually have different In several cases these transitions are expected to end in a second critical point.

Examples of polyamorphism are the existence of six-coordinated and four-coordinated amorphous silicon, and the different density phases of amorphous ice. Silicon (ˈsɪlɪkən or /ˈsɪlɪkɒn/ silicium is the Chemical element that has the symbol Si and Atomic number 14 Amorphous ice is an Amorphous solid form of water meaning it consists of Water molecules that are randomly arranged like the atoms of common Glass. In the case of amorphous ice the transition occurs below zero Celsius, so it is not a true equilibrium transition, the stable crystalline ices are the equilibrium phases. Ice is a Solid phase, usually crystalline, of a Non-metalic substance that is liquid or gas at Room temperature, such as Ammonia There is also continued debate over whether the transformations between the various high density and low density amorphous ices are first order-like or continuous-like transitions.

Yttria-Aluminates are another system believed to exhibit polyamorphism in the supercooled liquid and glassy states.

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