This transition is in contrast to the freezing or crystallization transition, which is a first-order phase transition in the Ehrenfest classification and involves discontinuities in thermodynamic and dynamic properties such as volume, energy, and viscosity. The consequence of this dramatic increase is a glass exhibiting solid-like mechanical properties on the timescale of practical observation. The transition comprises a smooth increase in the viscosity of a material by as much as 17 orders of magnitude within a temperature range of 500 K without any pronounced change in material structure. The glass transition of a liquid to a solid-like state may occur with either cooling or compression.
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