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It's not a liquid.It's a crystal.Glass can relax and distort which is why it's sometimes thicker at the bottom than at the top in very, very old windows.
Glass is a metastable substance called a mineraloid. It is metastable, i.e., it will break down into small stable crystals of "sand." Glass, along with granite and rhyolite, are all metastable substances. Glass is just the shortest lived - lasts less than about 250,000,000 years. The answer to Question 1 is TRUE. Glass is frozen liquid because not all - only part - of the atoms are not in a crystal matrix.As for rubber - go ask a rubber tree. Then rubber changes when it is combined with sulfer and heated and than there are a couple (at least) of types of artificial rubber so I do not have a clue.
Glass as a liquidOne arguably justifiable belief is that glass is a liquid of practically infinite viscosity at room temperature and as such flows, though very slowly, similar to pitch. Glass is generally treated as an amorphous solid rather than a liquid, though different views can be justified since characterizing glass as either 'solid' or 'liquid' is not an entirely straightforward matter . However, the notion that glass flows to an appreciable extent over extended periods of time is not supported by empirical evidence or theoretical analysis.
There is no clear answer to the question "Is glass solid or liquid?". In terms of molecular dynamics and thermodynamics it is possible to justify various different views that it is a highly viscous liquid, an amorphous solid, or simply that glass is another state of matter which is neither liquid nor solid.
No day in which you learn something is a complete loss.
Hmmmmm.Looks like there isn't a lot of consensus regarding the liquid/solid/amorphous solid etc...
Could a metastable substance behave hydraulically in a state of confinement? That is, if it can no longer be compressed, can if flow?Mike