The liquid–glass transition is observed in many polymers and other liquids that can be supercooled far below the melting point of the crystalline phase. This is atypical in several respects. It is not a transition between thermodynamic ground states: it is widely believed that the true ground state is always crystalline. Glass is a quenched disorder state, and its entropy, density, and so on, depend on the thermal history. Therefore, the glass transition is primarily a dynamic phenomenon: on cooling a liquid, internal degrees of freedom successively fall out of equilibrium. Some theoretical methods predict an underlying phase transition in the hypothetical limit of infinitely long relaxation times.Gotze, Wolfgang. "Complex Dynamics of Glass-Forming Liquids: A Mode-Coupling Theory." No direct experimental evidence supports the existence of these transitions.
The liquid–glass transition is observed in many polymers and other liquids that can be supercooled far below the melting point of the crystalline phase This is atypical in several respects It is not a transition between thermodynamic ground states it is widely believed that the true ground state is always crystalline Glass is a quenched disorder state and its entropy density and so on depend on the thermal history Therefore the glass transition is primarily a dynamic phenomenon on cooling a liquid internal degrees of freedom successively fall out of equilibrium Some theoretical methods predict an underlying phase transition in the hypothetical limit of infinitely long relaxation timesGotze Wolfgang "Complex Dynamics of Glass-Forming Liquids A Mode-Coupling Theory" No direct experimental evidence supports the existence of these transitions