Question

Why is glass considered a super cooled liquid?

Answer 1

Glass is basically an amorphous solid. It does not form a crystalline structure. So, the constituent particles of the glass can move. In regular solids, there is no movement of constituent particles under normal conditions.Due to this fluidity property,$\text{glass is called as supercooled liquid}$. Glass can be considered as a liquid of extremely high viscosity.The evidence of the fact can be seen in the windows getting thicker at bottom over a period of time.