Is glass a solid or a liquid?

Is glass a solid or a liquid? When you look at the title, you might say that of course it's a solid, but glass is not technically a solid, it's a semi-solid and semi-fluid state with a fairly slow flow rate. 

Many old churches in the west, which have been used for more than a century, have glass windows that are thin on top and thick on the bottom. This means that when a piece of flat glass is held vertically upright for a hundred years, it becomes thinner on top and thicker on the bottom, giving it the appearance of a liquid state. In fact, many popular science books and TV propaganda films have said this popular science knowledge, it is nothing new. Is glass a solid or a liquid?

Glass is not crystalline, amorphous, polycrystalline and mixed.The name of the theory is the glassy state.The characteristics of glassy state at room temperature are short-range order, that is in the range of several or dozens of atoms, the atoms are arranged in order, showing the crystal characteristics. It is long-range disorder, in which the number of atoms is increased. It becomes a disordered arrangement similar to that of a liquid.

Macroscopically, glass is a solid substance. The reason for this structure is that the viscosity of glass changes too quickly with temperature and the crystallization rate is too slow. As the temperature drops and the crystals begin to crystallize, the viscosity becomes so large that the movement of the atoms is limited, resulting in this effect. So, the glassy state is like a solid liquid, where the atoms are always in the process of crystallization.

So the atoms in the glass seem to be in a fixed position, but there are still forces between the atoms that cause it to have a tendency to rearrange.