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What is the glass transition temperature? What is the difference between glass transition and melting point?...

What is the glass transition temperature? What is the difference between glass transition and melting point? (Please briefly description)

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Solution : Glass transition temperature (Tg):

Glass transition temperature is the temperature at which higher moleculer weight materials (polymer) transforms from glassy state to a viscous and rubbery state.

Metals are crystalline in nature so they have a well defined melting point temperature but amorphous substance like polymers don't have a sharp melting temperature, instead they have a range of temperature over which they melt

Metals are crystalline in nature so they have a well defined melting point temperature but amorphous substance like polymers don't have a sharp melting temperature, instead they have a range of temperature over which they melt

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