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 that is neither liquid nor solid. The difference is semantic. In terms of its material properties we can do little better. There is no clear definition of the distinction between solids and highly viscous liquids. All such phases or states of matter are idealisations of real material properties. Nevertheless, from a more common sense point of view, glass should be considered a solid since it is rigid according to everyday experience.
11 months ago
Last edited at 7:31AM on 5/8/2013
technically, yes. Glass is not a solid, but is actually a supercooled liquid. and since glass does not change its state of being when it goes from liquid to solid form, it is not considered an actual solid by scientific definition.