Question:
The temperature at which non-crystalline material transforms from a supercooled liquid to rigid glass is
The temperature at which non-crystalline material transforms from a supercooled liquid to rigid glass is
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Glass transition temperature \(T_g\) is the temperature at which an amorphous material changes from supercooled liquid behavior to rigid glassy behavior.
Updated On: May 7, 2026
- Melting point
- Boiling point
- Softening point
- Glass transition temperature
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The Correct Option is D
Solution and Explanation
Glass is a non-crystalline or amorphous material.
Unlike crystalline solids, glass does not have a sharp melting point.
When molten glass is cooled, it does not suddenly crystallize.
Instead, it gradually becomes more viscous.
At a particular temperature range, the supercooled liquid changes into a rigid glassy solid.
This characteristic temperature is called:
\[
\text{Glass transition temperature}.
\]
It is commonly represented as:
\[
T_g.
\]
Below \(T_g\), the material behaves like a rigid glass.
Above \(T_g\), it behaves more like a supercooled liquid or rubbery material depending on composition.
Melting point is associated with crystalline solids.
Boiling point is the temperature at which liquid changes to vapor.
Softening point is related to deformation under load, not the exact transition from supercooled liquid to rigid glass.
Therefore, the correct answer is:
\[
\text{Glass transition temperature}.
\]
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