Is Glass A Solid Or A Liquid?

Chemistry





Photo credit:

Make up your mind, glass. jurra8

Before Pilkingtons invented plate glass in the mid-19th century, flat panes could not be made. Old windows are uneven.

Some once thought this was because glass is a liquid that flows down slowly over the centuries. That’s wrong. But although glass does not move on timescales as “short” as centuries, the true nature of glass, whether it is truly solid or a very viscous liquid is something we do not know.