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Which one of these is not a phase transition?
Which one of these is not a phase transition?
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Solution
The correct option is C glass transition
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 a typical 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. So it is not right to call glass transition as phase transition.
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 a typical 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. So it is not right to call glass transition as phase transition.
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