Glass is a –

A. superheated solid
B. supercooled liquid
C. supercooled gas
D. superheated liquid
Answer» B. supercooled liquid
Explanation: Glass is an amorphous (non- crystalline) solid material. Glasses are typically brittle and optically transparent. The standard definition of a glass (or vitreous solid) is a solid formed by rapid melt quenching. However, the term glass is often used to describe any amorphous solid that exhibits a glass transition temperature Tg. If the cooling is sufficiently rapid (relative to the characteristic crystallization time) then crystallization is prevented and instead the disordered atomic configuration of the supercooled liquid is frozen into the solid state at Tg. Generally, the structureof a glass exists in a meta-stable state with respect to its crystalline form.
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