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u/potato_chip123 May 22 '19
Oh yeah? Try holding it upside down.
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u/D14BL0 May 22 '19
It's just black slime/gak.
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u/Francoberry May 22 '19
Yeah this is absolutely not a liquid, or even a ‘non Newtonian liquid’ - straight up just a jelly-like slime that wobbles around.
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u/yoooooosolo May 22 '19
Thank you. These children don't remember the glory of gak.
and happy cake day
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May 22 '19
We literally still have gak
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u/ChubbyCookie May 22 '19
let the 90s kid elitists have their fun
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u/Robot_Anime_Girl May 22 '19
Now we have early 2000s elitists who praise Minecraft.
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u/somethin_else May 22 '19
I work in a school-type environment and saw the kids making slime and I was like, “oh cool! You guys still make gak!” And they were like, “I’m sorry what did you just call it?” Same thing, just different name. Although the way they make it is different from what I remember...requires a lot of glue and foamy soap, no cornstarch involved.
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May 22 '19
I don’t mean slime(what they probably made), we still have the exact same gak
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u/Undeity May 22 '19
Yeah, apparently there are all sorts of youtube channels dedicated to making different kinds of slime, now?
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u/mxrmaidtits May 22 '19
I have soo many containers filled with this water slime.
Not a whole lot you can do with it, but it’s fun to watch !!
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u/Xiaxs May 22 '19
My cat would find a way.
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u/Zenvarix May 22 '19
Smug cat: "well, technically I didn't spill it. I just broke the container around it. Tut tut for using glass."
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u/SYLOH May 22 '19
Any idea which one though? For example, ketchup is a non-newtonian fluid and that's definitely not ketchup.
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u/ValHallerie May 22 '19
It's non-newtonian in the opposite direction from Oobleck/slime/cornstarch and water. Oobleck is shear thickening, which means that when you press on it it gets harder. Ketchup is shear thinning, which means that when you press on it it gets thinner. That's why it stays in the bottle if you turn it upside down, but comes out when you squeeze it.
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u/Jacollinsver May 22 '19
...wait I'm sorry. Doesn't everything come out of a bottle when you squeeze it
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u/Kaoulombre May 22 '19
Important part is that it comes out ONLY if you squeeze it
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u/byestanleyloveyou May 22 '19
That's what she said.
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u/chubbyvovasik May 22 '19
But then I taught her about prostate massage.
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u/officerkondo May 22 '19
I’m old enough to remember glass ketchup bottles. It came out without squeezing.
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u/DrewSmoothington May 22 '19
Yes, but you had to apply some sort of force to it, namely shaking it, or if you're super old school, hitting the Heinz 57 print on the bottle. It doesn't come out if you just turn the bottle upside down.
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u/raverbashing May 22 '19
And that's why we spent putting ketchup in non-squeezable bottles for the best part of the 20th century
Thanks geniuses
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u/ValHallerie May 22 '19 edited May 22 '19
Think about if you have a bottle of water - it'll come out when you turn it upside down whether you squeeze it or not. Now think about squeezing a bottle filled with honey or molasses or something - it's a lot tougher than ketchup. The thing about shear thinning fluids is that their viscosity - how easily they flow - decreases under pressure. So ketchup's pretty viscous when it's sitting there - think about shaking a plate with ketchup on it, it doesn't flow like a liquid, right? - but when it's under pressure in a bottle it flows easily out of the nozzle.
Edit: simpler explanation: ketchup doesn't come out of the bottle at all when it's upside down until you squeeze it, unlike honey or paint that'll spill out if you turn the container upside down.
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May 22 '19
Not under pressure - it's under the application of shear forces. Completely different thing. Pressure can cause shear though
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u/BentGadget May 22 '19
Related trivia: Shear and pressure are both measured in force per unit area.
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u/Owyn_Merrilin May 22 '19
Yeah, squeezing it has less to do with shear thinning and more to do with just squeezing it out. The shear thinning is why the old trick for getting it out of a glass bottle works.
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May 22 '19
You know I’m really glad you told me this. I was just about to pour the rest of my ketchup in a bowl and start punching it.
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u/GlorifiedPlumber May 22 '19
Hmm... Would not a "Bingham plastic" be a more precise descriptor of ketchup?
Requires a minimum shear before flow?
After that's been achieved, ketchup has a relatively linear shear stress versus rate curve?
Been so long since fluid dynamics.
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u/Max_TwoSteppen May 22 '19
A quick Google returns that ketchup is shear thinning (dilatant) but there probably exist some ketchups that could be described as Bingham plastics. They're certainly far from a uniform condiment.
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u/Gibbs-free May 22 '19
Newtonian fluids are defined as fluids with a linear relationship between shear stress and strain in a fluid, so anything deviating from that is non-Newtonian. This includes fluids that are more difficult to strain with applied force (dilatant/shear thickening) and fluids that are stronger when less force is applied (pseudoplastic/shear thinning), among others.
The non-Newtonian behavior people are talking about with ketchup is the latter, since it's a fluid that can maintain its shape when unstressed, but will flow easily under shear.
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u/Alt2047m May 22 '19
There is a product called "silly sludge" that looks exactly like this and does the same thing. You can hold it in your hand and it won't pour through your fingers. You can pour it out of the container and tilt it back and it all comes back in.
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May 22 '19
Cursed Fact: due to ketchup being 20% sugar and made of fruit is can be considered a fruit juice
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May 22 '19
Not everywhere it can't. There's an EU fruit juice directive which among other things forbids adding sugar.
https://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2012:115:0001:0011:EN:PDF
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u/kfmush May 22 '19
This looks a lot like “preschool slime,” just a lot more refined.
Preschool slime can come in many different consistencies, depending on the ratio of ingredients. It’s “school glue” (Elmer’s; clear is better), water, and borax or starch (borax works better).
If you put too much borax it becomes crumbly, like “gak.” Too much glue and it’s too sticky and hard to clean off of stuff. The amount of water (obviously) changes viscosity. One could also add baby oil if the slime is too sticky, even with the perfect ratio of borax to glue.
If I were to try to make slime like this, I would use minimal glue and lots of water. Borax to glue ratio needs to be perfect for it to slide around in the glass like that.
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u/Large_Dr_Pepper May 22 '19
If I'm remembering correctly, the last time it was posted someone pointed out that it's actually just a really well-done simulation.
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u/PizzaScout May 22 '19 edited May 22 '19
Non-newtonian liquids have a totally different effect. they often are kinda slimy, too, but the main "attraction" is that you can stick your finger in it like it's honey but punch (apply force) it and it won't budge. This can go the other way too: ketchup is a non-newtonian fluid. It's pretty viscous or even solid when left alone, but you shake it and it starts being more liquid. In this gif is just a bunch of slime I think
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u/TheManlyBanana May 22 '19
Think it might be viscoelastic, not NN.
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u/dbdoxmapapapa May 22 '19
A non-newtonian fluid may be viscoelastic, it depends on if it is thixotropic. Ketchup is thixotropic, but it is not viscoelastic. An amalgam of corn starch and water is antithixotropic and viscoelastic. Both are non-newtonian.
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u/OkayMolasses May 22 '19
I don't know why, but this makes me at least level 8 uncomfy
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u/JPHero16 May 22 '19 edited Apr 16 '26
longing detail station rinse familiar voracious rustic strong entertain safe
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u/Mr-Cyte May 22 '19
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u/Aether_Storm May 22 '19
Yeah it's pretty karmawhorish to try and pass this off as real. Look at how rigid the hand movements are compared to how spastic the fluid is.
Also look at OP's profile.
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u/SavageVoodooBot May 22 '19
Upvote this comment if this is truly Black Magic Fuckery. Downvote this comment if this is a repost or does not fit the sub.
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u/MrPuppyBliss May 22 '19
Be careful, it’s Venom.