| (Pages: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 ... 23) | |
Gone Gonzo Posts: 2864 Joined: 29 Nov 2007 | |
Paperboy Posts: 20 Joined: 30 Jan 2008 |
I'm sorry but chemists are not experts on the states of matter by any definition. Physicists are.... and I happen to be well trained in both... chemical engineering bachelors and a masters in polymer science and one in polymer engineering. Glass is a liquid. |
Press Junketeer Posts: 371 Joined: 29 Dec 2007 | According to Wikipedia, "in the scientific sense the term glass is often extended to all amorphous solids (and melts that easily form amorphous solids), including plastics, resins, or other silica-free amorphous solids." According to some university's website the making of glass involves "forming a thick syrup and eventually an amorphous solid. The molecules then have a disordered arrangement, but sufficient cohesion to maintain some rigidity. In this state it is often called an amorphous solid or glass." Amorphous solids are solids which lack the molecular structure that most solids have, most commonly due to a rapid cooling of the material from it's liquid state. Cotton candy is also considered an amorphous solid. I, however, am not a physicist nor have I studied glass in any detail. Just writing what I found on a quick search through Google. |
Paperboy Posts: 20 Joined: 30 Jan 2008 |
In that case your definition of a liquid need to be called up. By the grade school definition anything that maitains its volume and flows into the shape of its container is a liquid. Just because we don't live long enough to see it doesn't mean its not flowing. |
Pulitzer Laureate Posts: 823 Joined: 22 Aug 2006 |
The POV expressed early on in the xkcd about Mythbusters (before the zombie walks in) is exactly how I feel about it. They claim to be busting myths, but they go about it so badly, that you simply can't depend on what they're doing. Entertaining, sometimes, sure, but half the time they aren't even really trying. |
Paperboy Posts: 36 Joined: 4 Jan 2008 |
yes but not all eskimo are inuit there are other tribes |
Beat Writer Posts: 207 Joined: 13 Feb 2008 |
Nah, to old. In my country (South Africa) we have internet, shopping malls cars and even cities. I am now choking on my own rage. Africa may be made up of genocidal maniacs but we are NOT all jungle dammit! |
Gone Gonzo Posts: 1486 Joined: 7 Mar 2008 |
funny how i learned about the different states of matter in chemistry class not physics :) and btw if you look quickly at wikipedia, http://en.wikipedia.org/wiki/Glass with many citations, it's stated it's a liquid i'd go track down the pyscho clown cause he has a doctorate in polymer physics, which deals mostly with plastics not glass and ask him but he's a bit busy opening his store |
Press Junketeer Posts: 433 Joined: 2 Mar 2008 | Here's anothe rone. "Human treadmills powered medieval cranes. Blind people were preferred so that they wouldn't be scared by how high up they were and by how poorly the machines were built." Also from Ripley's. Awesome. |
Paperboy Posts: 11 Joined: 18 Jul 2006 | Last week someone told me this: If someone jumps in front of a train, in order to classify as a person, police have to find at least 30 kg of human meat on the tracks. Which made me think of the following, rather disturbing question; would you, finding only 28 kg's, get out a toothpick and start picking the wheels? |
Paperboy Posts: 26 Joined: 15 May 2008 | heres 2 random facts you might not know bats are mammals and Hitler was a vegetarian |
Gone Gonzo Posts: 1809 Joined: 14 Nov 2007 |
More interestingly, could you get away with murder by pushing someone in front of a train? |
Gone Gonzo Posts: 3306 Joined: 23 Dec 2007 | The fastest object ever made by humans is the Heilos 2 Solar Probe. It travelled 252,792km/h (70,220 meters/s) on record-set. The Solar probe is still in orbit around the sun today, ever so slightly inside the orbit of Mercury, thereby setting the record to the closest known obejct to our sun. |
Paperboy Posts: 20 Joined: 30 Jan 2008 |
Thats actually the most applicable to glass you can get except for specialists. Polymer physicists know more about this than anyone else, but again... what is that second word...physics.... hmmmm... And if you really look into it.... phase transitions are thermodynamic properties... thermo is a physics topic. (although chemists try to figure it out with varying levels of success...) |
Gone Gonzo Posts: 2993 Joined: 25 Jan 2008 |
Its one of those "There is no PC way to approach this, just back away slowly" situations. Just like Native American vs Indian, where they sure as hell aren't from India, but there's valid argument that they aren't "native" to America either.
I have never met anyone who thought bats were anything other than a mammal, or at least, never let it be known. |
Paperboy Posts: 20 Joined: 30 Jan 2008 | A platypus is the only mammal that has venom... (the males have spurs on their back legs) The opossum is the only marsupial outside of Australia. Cats male genitalia have spines... hence the noise cats make when... making babies... (gotta love PBS) Polar bears and grizzly bears are the same species. They are different sub-species of brown bear. Anacondas are the only creature known to consider humans as a regular part of their diet. (supposedly everything else that eats us doesn't do it by choice... just if the opportunity arises) |
Paperboy Posts: 30 Joined: 1 Jan 2008 | I did metallurgy and material engineering at university, and I know the answer to the 'What is glass?' question. And I'm not telling. |
Gone Gonzo Posts: 1486 Joined: 7 Mar 2008 |
funny part is glass isn't a polymer, stuff such as plastics, at least that's what my friend who has a doctorate in polymer physics did a lot of work with and most of the basic research you can do on polymer science. even that glass article on wikipedia said "not polymer science" |
Gone Gonzo Posts: 1486 Joined: 7 Mar 2008 | ancient ppl had a system of measurement that accurately measured the circumference of the earth better than we could until very recently |
Infamous Scribbler Posts: 635 Joined: 21 Feb 2008 |
I was taught that Hitler sent everyone not Aryan German to the camps. This whole, they don't teach this shit in the US because it messes with our image is starting to piss me off. |
Infamous Scribbler Posts: 635 Joined: 21 Feb 2008 | Sorry double post. Please Ignore. |
Paperboy Posts: 20 Joined: 30 Jan 2008 |
I don't see anywhere in my post that says glass is a polymer.... and as I mentioned before I have two masters degrees on polymers... I've done 5 years worth of research on phase transitions in polymers... so I kinda know this stuff. The reason why it mentions that in wikipedia is because polymer science has a lot to do with glass transitions... not real glass just the transition of a polymeric material from highly mobile segments to low mobility (think crankshaft motion). Gooey to pseudo-solid basically. |
Beat Writer Posts: 135 Joined: 6 Feb 2008 |
I'd like to point out that Thermodynamics is just maths with a little bit of physical intuition; anyone with a grasp of differential equations can derive it (if you mean stat thermo, then that's a completely different kettle of fish, but is still well understood by Chemists at least as well as by physicists). |
Paperboy Posts: 16 Joined: 13 May 2008 |
I'm pretty sure this is true about the bumble bee (the big fluffy ones), and so that is my contribution. |
Paperboy Posts: 20 Joined: 30 Jan 2008 |
I knew if I tried I could find a chemist to piss off.... lol GO CHEM E's!!! |
Paperboy Posts: 33 Joined: 30 Jan 2008 |
Wrong! |
Beat Writer Posts: 129 Joined: 14 Nov 2007 | Ok my turn -Coca-Cola would be green if colouring weren't added to it. and my favourite Charlie Chaplin once won third prize in a Charlie Chaplin look-alike contest. |
Paperboy Posts: 20 Joined: 30 Jan 2008 |
Yeah I'll call BS on that one. |
Press Junketeer Posts: 371 Joined: 29 Dec 2007 |
Technically, bumble bees can fly. A lot of people believe they can't because their muscles (or what they use in place of them) shouldn't have enough strength to lift them. However, when put through tests by scientists/biologists it was found that they create small eddies in the air which help them stay afloat via pressure differences. Also, this is 100 post. Hooray me! |
Paperboy Posts: 23 Joined: 25 Jan 2008 |
So you're calling BS on that one, and not the one about the mime getting stuck in his imaginary box? Anyway, Anne Boleyn (second wife of henry the eighth) had three breasts and six fingers on her left hand (or did she?) |
Anonymous Source Posts: 5 Joined: 2 Apr 2008 | The whole glass is a solid/liquid thing. |
Gone Gonzo Posts: 1486 Joined: 7 Mar 2008 |
no that's false on a few accounts, including the scientist thing quick google/wikipedia search proves that those claims are false there is a treatment but it's so the glass either dries well and/or doesn't stick together |
Gone Gonzo Posts: 1191 Joined: 12 Sep 2007 |
Dude, if you have two masters in science and engineering and you still think glass is a liquid then you seriously need to get your money back. Solids as a rule become plastic before becoming liquid. Heat a bar of steel enough and it will bend under its own weight. Put a bar of steel under enough pressure and it will flow. Put enough shear or torsional or bending force on a steel bar and it will fail plastically before it fails completely. No piece of steel has a completely regular, crystalline structure; there are always imperfections and discontinuities. Obviously none of that makes steel a liquid. The case is much the same for glass. The principle defining characteristic of a liquid as opposed to a solid (of either type) is that the molecules are not fixed in place strongly enough to deform elastically. Depending upon your classification proclivities (lumper versus splitter), glass is either a basic and common state of matter - an amorphous or vitreous solid with molecules fixed in a random pattern, as some have mentioned - or it is a special case of solid, an amorphous (as opposed to a crystalline solid, molecules fixed in a regular pattern) solid. The main definition of a solid is that is reacts to an application of force with elastic deformation; that is, even the most fragile solid has some amount of deforming elastically, meaning that it returns to its original structure after the force is removed. A liquid does not; it may return to its original shape after the force is removed, but the molecules in a given location are not the same molecules that were in that location before the deformation. Glass is a pure solid in that it either deforms elastically or it fails; it does not act like a liquid. If you apply a force to a piece of glass and then remove it, it either regains its original shape WITH THE SAME MOLECULAR STRUCTURE, or it remains deformed. If you apply a force to a liquid and then remove it, the liquid regains its original shape WITH DIFFERENT MOLECULAR STRUCTURE. The same molecules are present, but they are now in different locations and relationships. I don't know how to state that in a simpler fashion. Considering glasses as liquid deprives "liquid" of any meaning. You might just as well consider crystalline solids as liquids, too, since sufficient force causes deformation and flow. And of course gases are nothing but energetic liquids. And plasmas are nothing more than energetic liquids with unusual atomic structure. Either of those cases makes just as much sense as considering glasses as liquid. Here's a good reference on the pluses and minuses of the classification of glass. Read it. |
Press Junketeer Posts: 432 Joined: 23 Mar 2008 | Glass has properties of both solids and liquids, and is thus essentially undefined. Shut up already. |
Gone Gonzo Posts: 1486 Joined: 7 Mar 2008 |
when Hugh auditioned for the role of house, Bryan Singer said Hugh was a great example of a good american actor, not knowing Hugh was british and was faking the accent |
| (Pages: 1, 2, 3, 4< | |
That is correct. Older glass windows are thicker at the bottom because of the way the glass was made, however, and NOT due to flowing molecules. Unfortunately glass holds it's shape really well, until it is disturbed of course.
In old tims to shape glass, it as spun rapidly on a disk, causing it to strecth into a circle, and more glass would accumulate on the outside than on the inside, and as such, it's structurally unsound to put the ehavier part of glass on the top.