Question

why glass is considered as supercooled liquid?

Answer 1

The amorphous solids are called as super cooled liquid which allows molecules in the material to continue to move but in very very less large time  and as it does not form a crystalline structure , or we can say they have a tendency to flow like liquids that's why they are called as pseudo solids or supercooled liquids.

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Answer 2

Glass is sometimes called a supercooled liquid because it does not form a crystalline structure, but instead forms an amorphous solid that allows molecules in the material to continue to move. However, Scientific American indicates that amorphous solids are neither supercooled liquids nor solids.