The transition in amorphous materials (or in amorphous regions within semicrystalline materials) from a hard and relatively brittle "glassy" state into a molten or rubber-like state as the temperature is increased is called :

vetrification

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glass transition

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transition temperature

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melting

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Solution

The correct option is D glass transition
The transition in amorphous materials (or in amorphous regions within semicrystalline materials) from a hard and relatively brittle "glassy" state into a molten or rubber-like state, as the temperature is increased is called glass transition.

The temperature at which it occurs is called glass transition temperature.

Hence the correct option is B.

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