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Is glass a liquid?

I have heard somewhere that glass is a liquid instead of a solid. Is this true?

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http://math.ucr.edu/home/baez/physics/General/Glass/glass.html

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.

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Look at the profiles if medieval stain glass church windows. It's clear evidence that glass glows like a highly viscous fluid.
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The link listed covers that. The greater thickness of the window at the bottom is a choice, not the result of gravity.
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Glass is liquid at an extremely high temperature (not sure of the exact temp.) & it's molded/shaped while in liquid form. Once it cools, it becomes solid.

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No. Thats a myth.

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Derek54

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.

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It's a Newtonian fluid.

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cindysonthenet

I guess thats kind of the same thing as asking if an ice cube is a liquid. The answer is ice is a solid but when it melts its a liquid does that help you understand? hope so.

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Glass is a solid. It can liquefy if heated to a high enough temperature. In between its a semi solid as it is shapeable have you seen a glassblower?

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It's an interesting question. Glass windows in very old churches in England apparently often have a gap at the top, because the glass has flowed over the years.

I've never actually seen this, though...

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I never heard that. Interesting.
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