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68 Comments
- blake213, on 10/12/2007, -2/+105http://www.youtube.com/watch?v=f2XQ97XHjVw
http://www.youtube.com/watch?v=axoxKYzoNoA
http://www.youtube.com/watch?v=vCHPo3EA7oE
http://www.youtube.com/watch?v=WnDKOc0Ag28
http://www.youtube.com/watch?v=XlVHs54ZTFQ
http://www.youtube.com/watch?v=cuzn8wh8Fys
http://www.youtube.com/watch?v=WTCkVh9CWT8
http://www.youtube.com/watch?v=eqYY81luV7o - TheSaladMan, on 10/12/2007, -0/+42Because you can only put one link in a digg submission, not 8
- Vironex, on 10/12/2007, -2/+33Thanks a lot. Outdo me in front of my kids.
- esotericguy, on 10/12/2007, -2/+27Imagine sneaking that stuff into the special/regular Olympics?
or
So thats how Jesus did it! - AntBing, on 10/12/2007, -9/+31Looks like you forgot all about the English classes you had though.
- groceryheist, on 10/12/2007, -1/+22But will it blend? Probably not.
- Hoovooloo, on 10/12/2007, -1/+19From Wikipedia:
"A non-Newtonian fluid is a fluid in which the viscosity [speed at which it flows] changes with the applied strain rate."
They ARE non-Newtonian fluids. That's why you can run across them, but not easily walk or stand. The forces of a sudden impact of your foot == greater force == more resistant to flow. You sink because when you are not moving, impulse==0, the force is equal to your weight and the viscosity changes to become more water-like. - appleman108, on 10/12/2007, -1/+16Water + Cornstarch = Non-Newtonian Fluid
- doctechnical, on 10/12/2007, -1/+13I've got to stop posting to Digg after dropping acid. Dang, I don't remember typing it that way...
- cankillar, on 10/12/2007, -1/+13ever heard of duggmirror?
- marcuschi, on 10/12/2007, -0/+12OH and another thing...
can it stop bullets? - akifbayram, on 10/12/2007, -0/+11Mythbusters....
- consoneo, on 10/12/2007, -0/+11Another interesting use might be to have some projectile stopping fun :)
See what happens when you shoot different weapons at it :P - groceryheist, on 10/12/2007, -0/+10you'd explode the universe!
- S1ngular1ty1, on 10/12/2007, -0/+9True. It is not the amount of force applied that makes the difference, it is the rate at which you apply the force that makes this stuff thicken up. I've heard the military is trying to use similar type materials (non-newtonian) to act as flexible body armor. When a bullet strikes it the material would instantly thicken to stop the bullet then relax and be flexible afterward so the soldier can move freely.
Really cool stuff. - Xavier1012, on 10/12/2007, -0/+8I just went into my kitchen and added corn starch to a bowl of water. Its really fun to play around with and if you punch it really hard with your fist it doesn't splash. Totally amazing!
- devo6273, on 10/12/2007, -0/+7Can you imagine soldiers running around with bags of cornstarch and water strapped to their chests? Heh... and at night it could double as a comfortable water bed!
That would be interesting if someone actually tried using this mix to see what thickness would be required to stop small arms fire or something. - inactive, on 10/12/2007, -1/+8Quick! I need 400 gallons of corn starch & water STAT!
- inactive, on 10/12/2007, -0/+6I was just about to ask... Blendtech meets their match.
- sward2000, on 10/12/2007, -2/+7Cool finding! I want to try it right now!
- bradleyland, on 10/12/2007, -0/+5For once, this is an applicable question. It'd be really cool to see what happens.
- teknotant, on 10/12/2007, -0/+5Man has evolved.
- mo0o0ocow, on 10/12/2007, -0/+4Yeah, they are non-Newtonian fluids, actually. By definition, a non-Newtonian fluid's viscosity changes with an applied shear, and that depends on the shear rate (unsurprisingly, the rate at which the shear stress is applied). However, not all non-Newtonian fluids thicken when a shear is applied. Those that do are called shear-thickening fluids. On the other hand, some actually show a decrease is viscosity and are called shear-thinning fluids. One common example is ketchup, a member of a special class of fluids called Bingham plastics. You know why you have to hit the ketchup bottle to get the ketchup to come out? It's because ketchup is a shear-thinning non-Newtonian fluid, so its viscosity decreases when you hit the bottle. (Take this from someone in a fluids mechanics class right now.)
- Vironex, on 10/12/2007, -0/+5She's goin' slow.
http://www.duggmirror.com/ - ladnar016, on 10/12/2007, -0/+3My friends and i went out and bought 30 boxes of cornstarch from jewel and dominick's (we bough out jewel) and filled a cooler with it. it was the coolest thing ever, you could jump on it and stuff. heres the link http://youtube.com/watch?v=EHkjYund-vM
afterward we just put the lid on it and tried to save it, but in a week it reeeked, like idk digested ham, sewage, garbage and puke rolled into one. so we put it outside and let it freeze then slid the frozen oobleck into the garbage. - TheCaterpillar, on 10/12/2007, -0/+3http://en.wikipedia.org/wiki/Non-Newtonian_fluid
- Vetteguy182, on 10/12/2007, -0/+3I want to see what would happen if you put in a lit firecracker...
:D - elk1, on 10/12/2007, -0/+3no you are mistaken, all these videos were actually made specifically for this Digg post. any of them you think you saw before were actually cheap rip offs made before the fact
- ebaymag0t, on 10/12/2007, -0/+2I wonder what would happen if you put it in a vacuum.
- tektalk, on 10/12/2007, -1/+3The cornstarch monster looks like little people.
Anyways, heres the digg mirror direct link to site http://www.duggmirror.com/general_sciences/8_YouTube_Videos_Featuring_Non_Newtonian_Fluid_Experiments/#c5543893 - enivid, on 10/12/2007, -0/+2The cornstarch monster is pretty cool though. Can the same properties be observed on really fine sand? I thought I could reproduce very similar observations at beach with really fine sand.
- mt4055, on 10/12/2007, -1/+3So, if you have seen if before don't look at it. Some, for one reason or another have not seen these and find them interesting and just generally weird.
Dugg. - doctechnical, on 10/12/2007, -0/+2Interesting idea. Next time I have a mess of corn starch and an M-80 handy I'll let you know the results ;)
I'm guessing there would be a muffled "wump", then a bubble of smelly gas would rise through the surface as it re-liquified. That's only a guess, though. - marcuschi, on 10/12/2007, -1/+3But what happens if you threw a gallon of it at someone and they hit it with a baseball bat?
Can someone film it being thrown on a moving fighter jet? - Jozer99, on 10/12/2007, -1/+3Yes and no. Although find sand may exhibit some of the same properties as a non-Newtonian fluid, it is not a fluid, so it does not count. This may seem like a cop out, but in terms of the actual science of fluid mechanics, none of the equations that apply to a fluid (including non-Newtonian fluids) apply to things like fine sand.
On a different note, a couple of other common non-Newtonian fluids are Ketchup and Toothpaste. Both of these are called "Bingam Plastics", that is, when little or no force is applied to them, they are very viscous, but when force is applied, they become much thinner and viscous. This is why hitting a ketchup bottle makes ketchup come out, and why rubbing toothpaste on your teeth makes it turn from a thick gel to a thin liquid. - B13ND3D, on 10/12/2007, -0/+1I wonder if it would respond to different blender speeds
- axiomata, on 10/12/2007, -0/+1On the opposite side of the shear thickening non-Newtonian fluids (like the the corn starch and water mixture in these videos) are what are known as shear thinning fluids and Bingham plastics.
Basically they behave the opposite. Where cornstarch and water stiffens up when a shear stress is applied these are more solid by default but begin to flow like Newtonian fluids when pressures are applied. Examples of such materials aren't as cool, but they are just as useful. Good paint is shear thinning: it flows like a fluid over the wall when pressure is applied with a roller or paint brush but then once there, it doesn't drip like a liquid. Another example is toothpaste. It's pretty much a solid when it comes out of the tube but once you start brushing is becomes more fluid-like.
/just in case people are interested in the science behind it in addition to the "wow that's cool" - kd1s, on 10/12/2007, -0/+1That was because the flora from your feet got into the mix and multiplied. Warm, wet, with corn nutrient. Oh yeah.
BTW - if you ever cook something with a sauce and it's not as thick as you like, just mix a little bit of cornstarch with cold water, bring the sauce to a boil and stir in the slurry. It'll thicken right up. - mcpaige, on 10/12/2007, -0/+1we did the corn starch thing in high school....but didn't know the name of what it was.
- elroy, on 10/12/2007, -1/+2Dugg for "Lauren" in the last video.
- esotericguy, on 10/12/2007, -1/+2aww, it's people like you that made we wish i wasnt Catholic. So i could kill you without fear of Consequences.
- tidejwe, on 10/12/2007, -0/+1It would likely shatter. It's like if you allow silly putty to sit for a while, it slowly sloshes into a puddle, if you throw silly putty at the ground it bounces, but if you hit it really hard, like with a hammer, it shatters. A firecracker would be similar.
- elk1, on 10/12/2007, -1/+2another cool video of a non-newtonian fluid
http://youtube.com/watch?v=uWYxc8xhihg - democracysucks, on 10/12/2007, -0/+1That's one of the things that separates Christians from Catholics. You try to be saved by works, but we know salvation comes by grace.
- technogenius, on 10/12/2007, -0/+1Ahh, Dr. Seuss's Oobleck!
http://en.wikipedia.org/wiki/Oobleck - NeoPlatonist, on 10/12/2007, -0/+1...and blocked!
- tinapaal, on 10/12/2007, -0/+0wow. pretty good find. Now that you liked the movie, how about downloading it for your personal use.
http://www.definiteinfo.com/videos2/download-youtube-videos.html - flimbabulous, on 10/12/2007, -0/+0Cymatics FTW
http://video.google.com/videoplay?docid=7253148167375317006 - Rostin, on 10/12/2007, -0/+0@devo6273
Good idea. The guy mentioned in this article gave a grad seminar at my university a few months ago.
http://discovermagazine.com/2004/aug/bulletproof-fatigues/ - Sakk, on 10/12/2007, -0/+0It, STF, is already being used to stop bullets.
In a way that is, by adding it to fabrics, thus increasing the shear force strength of the fabric.
http://www.ccm.udel.edu/STF/pubs1.html -
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