Water's Glass Transition Temperature Explained
The glass transition temperature ($T_g$) marks the point where an amorphous solid, like glass or amorphous ice, transitions reversibly between a hard, brittle glassy state and a more viscous, rubbery state. It is not a sharp melting point but rather a range.
Determining Water's Glass Transition Temperature
For water, the glass transition temperature ($T_g$) is a widely studied property, especially concerning the formation of amorphous ice.
The accepted approximate value for the glass transition temperature of water is $-135^{\circ}\text{C}$.
This value aligns with the option provided:
- Option A: $-135^{\circ}\text{C}$
Context and Significance
This temperature is significantly lower than the freezing point of water ($0^{\circ}\text{C}$) and represents the point at which the disordered structure of liquid water becomes "frozen" into a solid, non-crystalline state without undergoing crystallization.
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