On Fri, May 15, 2020 at 12:17:56PM +0900, Stephen J. Turnbull wrote:
Terrible example, since a glass is just a geologically slow liquid. ;-)
That's a myth :-)
The key test for a liquid is not whether is flows, since solids also flow. (In solids, this usually happens very, very slowly, and is usually called "creep".) The key test is whether it can *drip*, and glass does not drip (except when molten).
Glass is considered a non-crystaline or amorphous solid.
Pitch, on the other hand, is a geologically slow liquid :-)
Arguments over the precise definition of states of matter are, to some degree, futile. I've seen amorphous solids described as "liquids that don't flow" and non-Newtonian liquids described as "solids that flow".