how is that relates to the glass which inhibit the characteristics of liquid?
Glass will flow and get thicker at the bottom over a long period of time. There is evidence that marble and even concrete exhibit this same tendency.
Glass is a liquid. Thus, it flows, just very very slowly. That means it will be thicker at the bottom, if mounted vertically, over a long period of time. After enough time has passed, the glass wont even be in the window anymore, it will have spilled downwards, just like spilling any other liquid. Just in extreme slow motion.
As a previous answerer said, glass is not a liquid, but is actually an amorphous solid. Over very long periods of time, glass will actually flow, which will explain why 100-year-old glass is thicker on the bottom than it is on top. The flow is a property of amorphous solids.
Glass is not in any way a liquid. Only some glasses are called a super cooled liquid, and it only means they were formed by cooling a liquid quickly not that they still are liquid. There is old glass which is hung horizontal yet it doesn't sag in the middle and the only reason glass is thicker at on end than the other in old glass was because of how they made that glass. Its thickness changes throughout the glass so its often even thicker somewhere in the middle than at the base.
And by the way, a super-cooled liquid is one that has been cooled below its freezing point and is still liquid, not a solid liquid - whoever first misused that term should be chastised severely. Water can be super cooled down to 28F. If a bit of ice is dropped in, the whole mass crystallizes instantly, becoming solid.
