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  Amorphous Solids

Amorphous Solids:

Amorphous solids have properties of rigidity and incompressibility to a certain extent however they do not have definite geometrical forms.

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Glasses:

Whenever certain liquids are cooled quickly there is no formation of crystals at a definite temperature, like occurring on slow cooling. The viscosity of the liquid rises steadily and lastly a glassy substance is formed.

The chief characteristics of a glass are rigidity, hardness, and capability to withstand shearing stresses that are all properties of the solid state. On other hand glasses are optically isotropic and on heating without any sharp transition passes into a mobile liquid. At high temperature glasses undergo phase transition whenever crystals separate first as they do form super-cooled liquid. Thus, glasses are regarded as amorphous solids or super cooled liquids also. Therefore, glassy or vitreous state is a situation in which certain substance can exist, lying among the solid and liquid states.

 

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