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[video=480,360]https://youtu.be/c6wuh0NRG1s[/video]
Is glass a solid or a liquid?
- Thread starter RockRat
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Didnt watch it yet. Heard it was an unstable super cooled liquid etc once.
It is known that glass windows over a long period, sag and the top becomes thinner, and the bottom becomes thicker. Thus giving it that distorted horizontal waved appearance.
Just watched it..... i could be wrong........... nah :lol:
It is known that glass windows over a long period, sag and the top becomes thinner, and the bottom becomes thicker. Thus giving it that distorted horizontal waved appearance.
Just watched it..... i could be wrong........... nah :lol:
I was told once that it's a liquid.
https://www.thoughtco.com/glass-a-liquid-or-a-solid-608340
Glass is a solid. It has a definite shape and volume. It does not flow. Specifically, it is an amorphous solid because the silicon dioxide molecules are not packed in a crystal lattice. The reason people thought glass might be a liquid was because old glass windows were thicker at the bottom than at the top. The glass was thicker some places than others because of the way it was made. It was installed with the thicker part at the bottom because it was more stable. If you want to get technical, glass can be a liquid when it is heated until it is melted. However, at room temperature and pressure, it cools into a solid.
Modern glass is produced in such a way that has an even thickness. When you look at modern glass windows, you never see the glass become thicker at the bottom. It is possible to measure any change in the thickness of the glass using laser techniques; such changes have not been observed.
Although the statement here that the mantle flows in a solid form is accepted in Earth science, strictly there is evidence for a tiny amount of liquid in the mantle in places (as a layer between crystal grain boundaries). Whereas fully liquid material cannot transmit S (shear) seismic waves as stated, crystalline mantle with a film of liquid between the crystals is detected by the seismic waves being slowed, not completely stopped (not transmitted at all, as occurs in a liquid).
You learn something every day!
Glass is a solid. It has a definite shape and volume. It does not flow. Specifically, it is an amorphous solid because the silicon dioxide molecules are not packed in a crystal lattice. The reason people thought glass might be a liquid was because old glass windows were thicker at the bottom than at the top. The glass was thicker some places than others because of the way it was made. It was installed with the thicker part at the bottom because it was more stable. If you want to get technical, glass can be a liquid when it is heated until it is melted. However, at room temperature and pressure, it cools into a solid.
Modern glass is produced in such a way that has an even thickness. When you look at modern glass windows, you never see the glass become thicker at the bottom. It is possible to measure any change in the thickness of the glass using laser techniques; such changes have not been observed.
Although the statement here that the mantle flows in a solid form is accepted in Earth science, strictly there is evidence for a tiny amount of liquid in the mantle in places (as a layer between crystal grain boundaries). Whereas fully liquid material cannot transmit S (shear) seismic waves as stated, crystalline mantle with a film of liquid between the crystals is detected by the seismic waves being slowed, not completely stopped (not transmitted at all, as occurs in a liquid).
You learn something every day!
I can see through all these answers. 
layful:
layful:
Just a little bit off topic... ummm when a truck or car goes past you on a dirt road throwing stones all over the place does it help to put you finger tips against the windscreen to absorb the shock of a stone hitting it and hopefully stopping it from shattering ?
Been told yes it does and no it won't.
Been told yes it does and no it won't.
I reckon it had something to do with the old safety glass days and windows shattering in your face.
Laminate glass it should not make any change.
Not that I would actually know.
Laminate glass it should not make any change.
Not that I would actually know.
in the old days the windows were not safety glass and would shatter if hit
these days the glass will only chip or crack so no its a waste of time
unless you still run a presafety glass car
http://secondchancegarage.com/public/windshield-history.cfm
these days the glass will only chip or crack so no its a waste of time
unless you still run a presafety glass car
http://secondchancegarage.com/public/windshield-history.cfm
Wishfull said:
Mmmmm. Don't know about that but what I have heard is, that if you use a glass cutter to score the glass and don't finish the break straight away and leave it until the next day the stress induced by the cutter dissipates, making a successful break less likely.
As far as I know you are correct Magoo, spent some time with a mate at his business, Glassier, learning to cut glass.
Was told to break the glass at the cut asap because it breaks cleaner, straight thru, straighter and with less difficulty.
Also part of the reason they dont like to trim down sheets of glass that have environmental age to them,
apart from they dont sell you new glass.
Clearly there are properties of glass that have to be paid attention to.
My mate unfortunately took his own life 25 yrs ago, miss him dearly, a great guy.
Pretty sad, and lessons from that event keep me watchful of other people and their pain.
Was told to break the glass at the cut asap because it breaks cleaner, straight thru, straighter and with less difficulty.
Also part of the reason they dont like to trim down sheets of glass that have environmental age to them,
apart from they dont sell you new glass.
Clearly there are properties of glass that have to be paid attention to.
My mate unfortunately took his own life 25 yrs ago, miss him dearly, a great guy.
Pretty sad, and lessons from that event keep me watchful of other people and their pain.
Mr Magoo said:
goldierocks said:
Mmm, what hasn't been said so far is at what temperature, as that will surely have an impact on the answer.?
Rob P.
As it says above "glass can be a liquid when it is heated until it is melted. However, at room temperature and pressure, it cools into a solid".PabloP said:
Standard soda lime glass (the most common kind of glass) melts at something on the order of 1500C, while top drawer silicon oxide has a glass melting point of in excess of 2300C. Both are a long way above room temperature.....
Is ice a liquid , is steel a liquid , most things have a melting point and return to liquid.
I would judge things on earth temperature range and therefore glass is a solid , as is steel, items like ice would be up for debate depending on where you live.
IMO
I would judge things on earth temperature range and therefore glass is a solid , as is steel, items like ice would be up for debate depending on where you live.
IMO
Glass never stops moving , look at an old window and it will be thicker at the bottom.
But keep heating and many become a gas. It is not where you live with things like ice or even mercury - it is their physical state. Ice is solid H2O. water the liquid form, steam the vapour form. A pane of glass does not flow, molten glass does flow. An ice cube does not know the shape of its container, liquid water can flow but does not fill the entire container, steam will fill the entire container.aussiefarmer said:Is ice a liquid , is steel a liquid , most things have a melting point and return to liquid.
I would judge things on earth temperature range and therefore glass is a solid , as is steel, items like ice would be up for debate depending on where you live.
IMO
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goldierocks said:But keep heating and many become a gas. It is not where you live with things like ice or even mercury - it is their physical state. Ice is solid H2O. water the liquid form, steam the vapour form. A pane of glass does not flow, molten glass does flow. An ice cube does not know the shape of its container, liquid water can flow but does not fill the entire container, steam will fill the entire container.aussiefarmer said:Is ice a liquid , is steel a liquid , most things have a melting point and return to liquid.
I would judge things on earth temperature range and therefore glass is a solid , as is steel, items like ice would be up for debate depending on where you live.
IMO
Interesting, thanks for your input goldirocks, makes sense
to me now. :Y:
