Prolly been posted before, but fun
Viscosity Chart ...
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Originally Posted by PimTac
So much for equating 0w20 as watery thin.
The only people who say a 20 grade is equal to water are the guys who say 4 inches is 8 inches.
So much for equating 0w20 as watery thin.
The only people who say a 20 grade is equal to water are the guys who say 4 inches is 8 inches.
Originally Posted by dave1251
Originally Posted by PimTac
So much for equating 0w20 as watery thin.
The only people who say a 20 grade is equal to water are the guys who say 4 inches is 8 inches.
I'm happy to be part of the "thin" camp then.
Originally Posted by PimTac
So much for equating 0w20 as watery thin.
The only people who say a 20 grade is equal to water are the guys who say 4 inches is 8 inches.
Originally Posted by ZeeOSix
I'm assuming all those materials are at 70 F. Maple syrup used to simulate SAE 30 in the movies ... lol. How many years does the test take to see window putty "flow".
Check out the fameous Pitch Drop experiment:
https://en.wikipedia.org/wiki/Pitch_drop_experiment
https://www.youtube.com/watch?v=BZvsrOciU_Q
I'm assuming all those materials are at 70 F. Maple syrup used to simulate SAE 30 in the movies ... lol. How many years does the test take to see window putty "flow".
Check out the fameous Pitch Drop experiment:
https://en.wikipedia.org/wiki/Pitch_drop_experiment
https://www.youtube.com/watch?v=BZvsrOciU_Q
Originally Posted by gfh77665
Originally Posted by ZeeOSix
I'm assuming all those materials are at 70 F. Maple syrup used to simulate SAE 30 in the movies ... lol. How many years does the test take to see window putty "flow".
Check out the fameous Pitch Drop experiment:
https://en.wikipedia.org/wiki/Pitch_drop_experiment
https://www.youtube.com/watch?v=BZvsrOciU_Q
That's interesting.
Originally Posted by ZeeOSix
I'm assuming all those materials are at 70 F. Maple syrup used to simulate SAE 30 in the movies ... lol. How many years does the test take to see window putty "flow".
Check out the fameous Pitch Drop experiment:
https://en.wikipedia.org/wiki/Pitch_drop_experiment
https://www.youtube.com/watch?v=BZvsrOciU_Q
That's interesting.
Stained glass on church windows that is super old will be thicker at the bottom than at the top. Glass is actually an extremely slow moving liquid as well.
Originally Posted by StevieC
Stained glass on church windows that is super old will be thicker at the bottom than at the top. Glass is actually an extremely slow moving liquid as well.
I believe there is an argument against that.
However, if you take a penny and double it each day, in less than a month you will have $1 million
Stained glass on church windows that is super old will be thicker at the bottom than at the top. Glass is actually an extremely slow moving liquid as well.
I believe there is an argument against that.
However, if you take a penny and double it each day, in less than a month you will have $1 million
Yeah I just read, we are sort of both right... Interesting... https://www.scientificamerican.com/article/fact-fiction-glass-liquid/
Quote
In medieval European cathedrals, the glass sometimes looks odd. Some panes are thicker at the bottom than they are at the top. The seemingly solid glass appears to have melted. This is evidence, say tour guides, Internet rumors and even high school chemistry teachers, that glass is actually a liquid. And, because glass is hard, it must be a supercooled liquid.
Glass, however, is actually neither a liquid—supercooled or otherwise—nor a solid. It is an amorphous solid—a state somewhere between those two states of matter. And yet glass's liquidlike properties are not enough to explain the thicker-bottomed windows, because glass atoms move too slowly for changes to be visible.
Solids are highly organized structures. They include crystals, like sugar and salt, with their millions of atoms lined up in a row, explains Mark Ediger, a chemistry professor at the University of Wisconsin, Madison. "Liquids and glasses don't have that order," he notes. Glasses, though more organized than liquids, do not attain the rigid order of crystals. "Amorphous means it doesn't have that long-range order," Ediger says. With a "solid—if you grab it, it holds its shape," he adds.
When glass is made, the material (often containing silica) is quickly cooled from its liquid state but does not solidify when its temperature drops below its melting point. At this stage, the material is a supercooled liquid, an intermediate state between liquid and glass. To become an amorphous solid, the material is cooled further, below the glass-transition temperature. Past this point, the molecular movement of the material's atoms has slowed to nearly a stop and the material is now a glass. This new structure is not as organized as a crystal, because it did not freeze, but it is more organized than a liquid. For practical purposes, such as holding a drink, glass is like a solid, Ediger says, although a disorganized one.
Like liquids, these disorganized solids can flow, albeit very slowly. Over long periods of time, the molecules making up the glass shift themselves to settle into a more stable, crystallike formation, explains Ediger. The closer the glass is to its glass-transition temperature, the more it shifts; the further away from that changeover point, the slower its molecules move and the more solid it seems.
Whatever flow glass manages, however, does not explain why some antique windows are thicker at the bottom. Other, even older glasses do not share the same melted look. In fact, ancient Egyptian vessels have none of this sagging, says Robert Brill, an antique glass researcher at the Corning Museum of Glass in Corning, N.Y. Furthermore, cathedral glass should not flow because it is hundreds of degrees below its glass-transition temperature, Ediger adds. A mathematical model shows it would take longer than the universe has existed for room temperature cathedral glass to rearrange itself to appear melted.
Why old European glass is thicker at one end probably depends on how the glass was made. At that time, glassblowers created glass cylinders that were then flattened to make panes of glass. The resulting pieces may never have been uniformly flat and workers installing the windows preferred, for one reason or another, to put the thicker sides of the pane at the bottom. This gives them a melted look, but does not mean glass is a true liquid.
Quote
In medieval European cathedrals, the glass sometimes looks odd. Some panes are thicker at the bottom than they are at the top. The seemingly solid glass appears to have melted. This is evidence, say tour guides, Internet rumors and even high school chemistry teachers, that glass is actually a liquid. And, because glass is hard, it must be a supercooled liquid.
Glass, however, is actually neither a liquid—supercooled or otherwise—nor a solid. It is an amorphous solid—a state somewhere between those two states of matter. And yet glass's liquidlike properties are not enough to explain the thicker-bottomed windows, because glass atoms move too slowly for changes to be visible.
Solids are highly organized structures. They include crystals, like sugar and salt, with their millions of atoms lined up in a row, explains Mark Ediger, a chemistry professor at the University of Wisconsin, Madison. "Liquids and glasses don't have that order," he notes. Glasses, though more organized than liquids, do not attain the rigid order of crystals. "Amorphous means it doesn't have that long-range order," Ediger says. With a "solid—if you grab it, it holds its shape," he adds.
When glass is made, the material (often containing silica) is quickly cooled from its liquid state but does not solidify when its temperature drops below its melting point. At this stage, the material is a supercooled liquid, an intermediate state between liquid and glass. To become an amorphous solid, the material is cooled further, below the glass-transition temperature. Past this point, the molecular movement of the material's atoms has slowed to nearly a stop and the material is now a glass. This new structure is not as organized as a crystal, because it did not freeze, but it is more organized than a liquid. For practical purposes, such as holding a drink, glass is like a solid, Ediger says, although a disorganized one.
Like liquids, these disorganized solids can flow, albeit very slowly. Over long periods of time, the molecules making up the glass shift themselves to settle into a more stable, crystallike formation, explains Ediger. The closer the glass is to its glass-transition temperature, the more it shifts; the further away from that changeover point, the slower its molecules move and the more solid it seems.
Whatever flow glass manages, however, does not explain why some antique windows are thicker at the bottom. Other, even older glasses do not share the same melted look. In fact, ancient Egyptian vessels have none of this sagging, says Robert Brill, an antique glass researcher at the Corning Museum of Glass in Corning, N.Y. Furthermore, cathedral glass should not flow because it is hundreds of degrees below its glass-transition temperature, Ediger adds. A mathematical model shows it would take longer than the universe has existed for room temperature cathedral glass to rearrange itself to appear melted.
Why old European glass is thicker at one end probably depends on how the glass was made. At that time, glassblowers created glass cylinders that were then flattened to make panes of glass. The resulting pieces may never have been uniformly flat and workers installing the windows preferred, for one reason or another, to put the thicker sides of the pane at the bottom. This gives them a melted look, but does not mean glass is a true liquid.
Last edited:
Originally Posted by dave1251
Originally Posted by PimTac
So much for equating 0w20 as watery thin.
The only people who say a 20 grade is equal to water are the guys who say 4 inches is 8 inches.
In other words, liars.
Originally Posted by PimTac
So much for equating 0w20 as watery thin.
The only people who say a 20 grade is equal to water are the guys who say 4 inches is 8 inches.
In other words, liars.
Originally Posted by gfh77665
Check out the famous Pitch Drop experiment:
https://en.wikipedia.org/wiki/Pitch_drop_experiment
https://www.youtube.com/watch?v=BZvsrOciU_Q
I've seen some engines in real life (and on YouTube) that had oil *almost* that bad when the plug was pulled!
Check out the famous Pitch Drop experiment:
https://en.wikipedia.org/wiki/Pitch_drop_experiment
https://www.youtube.com/watch?v=BZvsrOciU_Q
I've seen some engines in real life (and on YouTube) that had oil *almost* that bad when the plug was pulled!
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Originally Posted by dave1251
Originally Posted by PimTac
So much for equating 0w20 as watery thin.
The only people who say a 20 grade is equal to water are the guys who say 4 inches is 8 inches.
Originally Posted by PimTac
So much for equating 0w20 as watery thin.
The only people who say a 20 grade is equal to water are the guys who say 4 inches is 8 inches.
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