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Glass Transition: Tg and Free Volume
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Tg is not a thermodynamic phase transition but a kinetic one: the glass "falls out of equilibrium" upon cooling, freezing an excess free volume that determines the viscosity (M2).

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ID:('ky', 1750)

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ID:(0, 1750)

gphysics.net - Dr. Willy H. Gerber
Palos Verdes, Costa de Corral, Región de los Rios, Chile