Aleš Lombergar

Glass is a solid when it is not molten. So your drinking glass, glasses, windows and the rest of anything made is actually a solid…Your professor is a nut. The only time glass is a liquid is when it is glowing red and molten and capable of taking any shape of its containter. Saying glass is a liquid is like saying the island of Hawaii is liquid…it came from a volcano so it was a liquid and then hardened on the surface. Same thing with glass.
The myth that you can see that glass is liquid because it is thicker at the bottom is not true…When glass was produced in those days is was made by laying it on a table and spinning the table to get the glass to spread out across the surface of the table. When you spin things the centrifugal force of spinning makes the glass move outwards. Since most of the glass would build up at the sides of the table when they cut the glass it would be thick on one end and thin on the other. They usually installed them thick side down to reduce glare. If you look at most old windows, yes, they will be thicker on the bottom. But if you look at a bunch of windows you will notice every once in awhile there will be one with a thicker top side because someone installed it incorrectly. Also some may say older windows are liquid because they seem to sag…this is not true….It is the lead they used in those days to seal the window. When installing they would run a bead of lead around the frame and then set the pane in place. Over the years of hot and cold temperature changes glass would push on the lead and since the lead cannot spring back into shape after being distorded it leaves space between the window and the frame. Everything expands and contracts in hot and cold temperature, even concrete and steel. Glass is a solid.
There were even experiments done to test this…a glass rod was placed to span two points so that only the ends of the rod were touching solid ground and the center was free to “droop”. A small weight was placed on the center of the rod and after the initial sag of the rod from the weight it never moved a single bit for the seven years of the experiment.

yes it is true

i think its a liquid beacase it depend wat it has inside!!!;}

man-made glass in liquid. when processed, they cool it so quickly that it never makes it to the solid phase. there is solid glass, such as volcanic glass which is formed naturally.