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/sci/ - Science & Math

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3548025 No.3548025 [Reply] [Original]

Someone told me today that glass is liquid. Can someone kindly explain this shit?

>> No.3548027

It isn't. That's a myth.

>> No.3548032

every "solid" you interact with everyday is actually a slowly-moving liquid

>> No.3548049

>>3548032
Surprise surprise. What about the churches with the thicker at the bottom windows?

>>3548032
So you mindfuck me with some weirder shit. explain?

>> No.3548053

>>3548049
Glass is hard to make. When one side is obviously heavier then another, you minimise the chances of breaking when you put the heaviest side at the bottom.

>> No.3548057

>amorphous
>without shape

>> No.3548059

>>3548053

What kind of shitty reasoning is this?

Then how come one side it was heavier in the first place??

>> No.3548066

>>3548025
http://en.wikipedia.org/wiki/List_of_common_misconceptions#Chemistry
It is not a liquid, it is an amorphous solid.

>> No.3548074

How can it be a liquid if it's the hardest metal?

>> No.3548077

>>3548049
"glass windows often have thicker glass at the bottom than at the top, and this has been cited as an example of the slow flow of glass over centuries. However, this unevenness is due to the window manufacturing processes used in earlier eras, which produced glass panes that were unevenly thick at the time of their installation. Normally the thick end of glass would be installed at the bottom of the frame, but it is also common to find old windows where the thicker end has been installed to the sides or the top. In fact, the lead frames of the windows are less viscous than the panes, and if glass was indeed a slow moving liquid, the panes would warp at a higher degree."

>> No.3548082

>>3548074
No, diamond is the hardest metal.

"Due to extensive research done by the University of Pittsburgh, diamond has been confirmed as the hardest metal known to man. The research is as follows. Pocket-protected scientists built a wall of iron and crashed a diamond car into it at 400 miles per hour, and the car was unharmed. They then built a wall out of diamond and crashed a car made of iron moving at 400 miles an hour into the wall, and the wall came out fine. They then crashed a diamond car made of 400 miles per hour into a wall, and there were no survivors. They crashed 400 miles per hour into a diamond traveling at iron car. Western New York was powerless for hours. They rammed a wall of metal into a 400 mile per hour made of diamond, and the resulting explosion shifted the earth's orbit 400 million miles away from the sun, saving the earth from a meteor the size of a small Washington suburb that was hurtling towards mid-western Prussia at 400 billion miles per hour. They shot a diamond made of iron at a car moving at 400 walls per hour, and as a result caused two wayward airplanes to lose track of their bearings, and make a fatal crash with two buildings in downtown New York. They spun 400 miles at diamond into iron per wall. The results were inconclusive. Finally, they placed 400 diamonds per hour in front of a car made of wall traveling at miles per iron, and the result proved without a doubt that diamonds were the hardest metal of all time, if not just the hardest metal known to man."

>> No.3548088

>>3548059

http://en.wikipedia.org/wiki/Glass#Behavior_of_antique_glass

The observation that old windows are sometimes found to be thicker at the bottom than at the top is often offered as supporting evidence for the view that glass flows over a timescale of centuries. The assumption being that the glass was once uniform, but has flowed to its new shape, which is a property of liquid.[36]

However, this assumption is incorrect; glass does not flow. The reason for the observation is that in the past, when panes of glass were commonly made by glassblowers, the technique used was to spin molten glass so as to create a round, mostly flat and even plate (the crown glass process, described above). This plate was then cut to fit a window. The pieces were not, however, absolutely flat; the edges of the disk became thicker as the glass spun. When installed in a window frame, the glass would be placed thicker side down both for the sake of stability and to prevent water accumulating in the lead cames at the bottom of the window.[37] Occasionally such glass has been found thinner side down or thicker on either side of the window's edge, the result of carelessness during installation.[38]

>> No.3548092

It is in the grey area between an idea that is so mundane you don't talk about it and ideas that are too fantastic to be believed. Of course it's false.

>> No.3548093

>>3548059
>Glass is hard to make.

>> No.3548098

>>3548059

Have you tried making a thin flat sheet of glass with 18th century technology? It's not easy! You have to hold the tray perfectly flat. If it's even a tiny bit off you get it thicker on one side.

>> No.3548103

>>3548053
>>3548059
In the old days, they extruded a bubble of glass, then expanded it by blowing into it through a tube, squished it against a spinning wheel and turned it into a giant circular pane of glass.

The outside of the circle was thicker than the inside due to centripetal force, and they used that as the bottom side, since it made life easier when using lead to stick it in place.

>> No.3548104
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3548104

>>3548098
fucking what? just make a perfectly flat table (they will have had spirit levels presumably) and then place the tray on it. you don't need to hold it at all.

>> No.3548111

>>3548104
No, you moron. How exactly are you going to sandwich it evenly without getting bubbles in it? With 18th century tech? They didn't exactly have perfect sheets of metal back then.

>> No.3548112

cheers guys :D

>> No.3548115

>>3548104

How do you get a spirit level that's perfectly accurate? It's not that easy you dumb sack of hammers. Sure, if you spend huge amounts of money, but for common use its not easy to get things flat.

>> No.3548122

>>3548115
they have to be accurate, they work due to gravity. the bubble always floats to the highest point it can, so any tilt will mean the bubble moves to one side or the other. if it rests exactly in the middle between the 2 lines, then the surface must be perfectly flat. spirit levels were invented in the 17th century btw, so 18th century glass makers will have had access to them.

>> No.3548125

>>3548122

How do you get your bubble tube mounted correctly to be parallel to the level body?

>> No.3548126

>>3548115
for the same reason, plumb lines are always perfectly accurate as well, and they were invented much earlier
http://en.wikipedia.org/wiki/Plumb_line

>> No.3548128

>>3548126

Ok, now all you need is to make your tray perfectly accurate with no twist or distortion.

>> No.3548134

>>3548125
spirit levels have a flat surface, so they can be placed against any other flat surface. the gradients of each will be the same, so if the surface it is on isn't flat, then the spirit level isn't flat either, and the bubble will indicate that this is so.

>> No.3548137

>>3548134
And how do you get your spirit level to be flat?

PROTIP: THE GLASS FOR THE SPIRIT LEVEL NEEDS TO BE A PERFECT CYLINDER TOO, AND NOT A WEIRD SHAPE- OH WAIT, YOU DON'T HAVE THE FUCKING PERFECT GLASS YOU MORON

>> No.3548138

>>3548134

For christ sake.... how would a caveman get all these perfectly flat lines and surfaces? That's the question you're trying to solve.

>> No.3548163

In the past, before methods for producing sheet glass were invented, glass for windows was made pretty much the same way as other glassware was.

You took some molten glass in the end of the... whatever they call that glass-maker's stick, and then they would spin it, until the glass would spin out into a large disc shape. This was then cooled and the flattest parts were cut into square shapes.

Because of the way that cooling glass flows, the disc would be thicker in some parts and thinner in others.

One of the indications of a glass-maker's skill was how even a disc he was able to make.

Another way was to make the window glass by blowing the glass into the shape of a large cylinder, cutting it open and heating it up until it straightened out.

But since the glass would be in contact with a surface, there were imperfections.

>> No.3548202

And then about spirit levels.

You don't need a closed glass tube to find out whether a surface is level and flat, though the spirit level WAS invented in the sixteen-hundreds.

The ancient egyptians invented ingenious tools for surveying which were basically constructed of pieces of string and some sticks. No water needed.

http://www.surveyhistory.org/egyptian_surveying_tools1.htm

>> No.3548239
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3548239

gaiz, gaiz, chill the fuck out
and have a glass of water

>> No.3548247

>>3548239
i agree with this guy

>> No.3548258

I didn't read the thread but glass is a non-newtonian fluid. Basically the molecules rotate, rather than forming stable crystals.

It's just dripping, really, really, really slowly. It's actually easy to see if you look at store's windows, you'll see some distortions in the glass. This is also mostly true of very old glass, like that which you may find on a historical site. You can easily see the "ripples" in glass from 2, 3 and 400 years ago.

>> No.3548291
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3548291

Guys, it's been answered. >>3548066
You're all making a spectacle of yourselves.

>> No.3548373

basically the thing with glass is that over a long period of time it flows like a liquid you can check out pics of it on google. But it goes deeper than that solids even flow if you wait long enough. Wood which is a solid warps. There are many more examples. Under the right pressure and temperature many material has potential to be in any state. Also hotter materials bend more easily you can think of it like after a certain point it is so bendy from heat that it pools. Also if you didn't know chemicals and liquids arent the same thing. Try this experiment bend something really dense then record the temperature. Then heat the material and bend it where it was heated and record the difference in raise of temperature. Ps glass that has alot of heat built up and stood upright and is thin has a greater opportunity to flow than a cooled more stable geometric shape.

>> No.3548410

>>3548373
>Liquids aren't chemicals

>> No.3548415

>>3548373
Warping isn't flow.
Solid materials will not flow in standard conditions when undisturbed.

Wood will warp due to moisture, tension and temperature. It is not flowing.

The only way that a solid material will 'flow' is when they decay and lose cohesion, turning into dust or similar product.

>> No.3548475
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3548475

>>3548258
>You can easily see the "ripples" in glass from 2, 3 and 400 years ago.