Definition of glass

Definition:- Glass is an amorphous or noncrystalline transparent or translucent supercooled solution of various slicate.

Properties:- 

1) Glass does not possess sharp boiling and melting point.

2) It is not a true solid,it is an amorphous solid.

3) Constituent particals are not arranged in a regular way.

4) It has short range order.(regular and predictable arrangement of the atoms over a short distance)

5) It is isotropic(Have physical properties same in different directions)

6) Cooling curve or glass is continuos.

Common formula of glass:- R₂O.MO.SiO₂

R is monovalent cation(Li, Na, K,...)

M is divalent cation (Mg, Can, Zn, Pb ...)