Why Your Pee Looks Like A Chain
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- Опубліковано 6 чер 2024
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Have you noticed the shape of your urine stream when you pee? It does this twisty undulating thing. But why? And why do the same waves appear when you pour a liquid from a container?
Here's my video featuring Rayleigh instability:
• The bizarre ripples th...
Here's my video about the Lattice Boltzmann Method:
• The Bizarre Way We Tra...
The fake medical advice at the end comes courtesy of not-fake Doctor Rohin Francis. This is his excellent channel:
/ @medlifecrisis
Here are a couple of good videos on laminar flow:
• Why Laminar Flow is AW...
• Laminar Flow DISAMBIGU...
Image and video credits:
The video of water floating in microgravity is by NASA
The Lattice Boltzmann animation is by Richard Sear
You can buy my books here:
stevemould.com/books
You can support me on Patreon here:
/ stevemould
just like these amazing people:
Matthew Cocke
Glenn Watson
Joseph Rocca
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Buy nerdy maths things: mathsgear.co.uk - Наука та технологія
The bad medical advice at the end comes from Medlife Crisis. You should visit his channel here: ua-cam.com/users/MedlifeCrisis
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Love that Dr. Francis is googling Matt Parker. 😂
I absolutely ended myself when Rohan answered the phone, and even more when he started nonchalantly whistling
.... too much pressure for that to happen
@@RyanWaldroop Actually I was using Bing
@@MedlifeCrisis Dang! I thought it might have been bing, but it sounds funny to say you're binging Matt Parker. I was more concerned you were using Internet Explorer.
SmarterEveryDay: Laminar flow is my favorite!
Veritasium: No, turbulent flow is better!
Steve Mould: why is my pee a chain
The P-chain
Haa😆😆 I'm also thinking same.
@@mari8761 It's a P-wave!
In 11 dimensions (give or take) it's a p-brane.
XD
No literature on it? Then let's call it Mould Effect #2!
i dont even know what to say other than hi and first
There is something concerning about a "Mould" in my urine.
Mould grand effect
Mould little effect
Mould last effect
Works for me!
how about the steve effect then?
"Let's approach as closely as possible to the Platonic Ideal of a stream of pis--"
This is the single greatest line in the entire history of UA-cam videos.
I bet the UA-cam demonetizer was like, 'YES! I got you now!... D'oh!"
Mhm, sure...
1:53
It’s even more funny when people cut out things like this. You know what it is but it cuts off right before it happens. That’s way better than not cutting it off
1:55
This man has just become the pouring liquid expert at this point and I’m here for this extremely niche content
So good to see you up and about
😂
Please tell me that Steve didn't even tell you what his fictional "condition" would be in the bit, and just had you vamping on about something vague. :-D
The phone cable not attached is a great touch!
I think I'm going to pull through
Eyyyyyy (◠‿◕)
The shape resembles a chain. I'd call it a water chain, and address each "pinch" as a waterlink.
Came to say the same.
good idea, but it should happen in any fluid with surface tension, not just water
First thought was that it looked chain-like. Completely agree, that's what it most resembles
That's what it's called in some fluid simulation papers, see Two Minute Papers' episode on a relatively recent simulation technique that can accurately simulate water chains: ua-cam.com/video/SxIkQt04WCo/v-deo.html
The Mould liquid chain effect.
Does he have a thing about chains?
Ive always considered myself to be of an analytical mindset. I'm always looking at things and trying to understand how they work. But the problem I always have is then explaining what I am now able to understand. But I love that your out here doing the homework for us and really answering the big questions that need answering. Love your channel. I look forward to learning something new Everytime I click on one.
Wasn’t sure if your video’s quality before watching, but I can say that this video is very well made. Job well done!
As a huge fan of both physics and piss this appeals to me greatly
Donald Trump approves of one of your interests
@@007liammurphy people love being lied to.
@@Spanky00Cheeks you are a handsome man and people like you
@@007liammurphy now I feel like must feel. :)
Orange man is gone. And while Orange man is bad, there are worse men and women out there. No. Just men. My bad.
@@Spanky00Cheeks waaaaaa. Haven't seen and feminists that are men in the comments before.
Rohin looking at picture of Matt, and his phone line being physically disconnected are the best parts of the bit. Solid colab :)
Aren't we all looking at pictures of Matt on our free time? :D
I didn't notice that the handset wasn't connected. Thanks for pointing it out.
Duh, it's a cordless phone
It completely caught me off-guard. Fantastic cameo, and way better than just having some random person pretend to be a doctor.
The fact that the wire was not plugged in immediately caught me off guard lol
Huh, that's weird. My pee has always made a sharp U-turn right, two lefts, stopped for about a minute mid air, then it comes back and circles around me five times before finally entering the toilet. Thought everyone peed like this.
Steve Mould is the science bomb of all You Tube. He always has the unusual not found anywhere, with intuitive explanations easy to follow. All schools should study Steve's work.
Wife: "What the heck are you doing in the bathroom?"
Man: "Experimenting!"
Lol
"So that's why you needs a ruler... suuure"
now, wouldn't it be normal to *be in the bathroom* while you pee?
"what the heck are you doing in the bathroom?"
"using it... what else would I be doing?"
Science cannot be stopped! I need more beer to continue this endeavour!
I like how its wife and man, as opposed to wife and husband
"This video is not about laminar flow."
> Destin has left the chat
> Veritasium has joined the chat
HAHA thats a good one xD
> Captain Disillusion has opened blender
Just about to post this, nice
UA-cam nerds are the best
I’m glad you’re answering the real questions
I've always wondered this! Thank you for satisfying my curiosity!
“The platonic IDEAL of a stream of pi-“
Very strictly platonic.
That part really cracked me up! 😂
YES! 1:58 I had to pause because I was laughing so hard.
I see an R.Kelly experiments
"Let's approach, as closely as possible, the platonic ideal of a stream of pi-."
Love it.
Glad I wasn't the only one who noticed!
So good
This is also my favorite part.
Stream of π
Just straight on to the topic man!! Real professional!
I had this question since high school! Never got it answered, even with 5 years studying physics at university! After 8 years finally I got an answer! Thank you!
10:53 Casually staring at a picture of Matt Parker, then picking up a telephone that isn’t even connected. Feels like the start of an adult film...
Didn't even notice the phone was disconnected until your comment, that makes it even better.
And the "Oh, and Steve, it's been good knowing you, man. Take care." was the cherry on the cake.
I love how you perfectly emulate the “disheveled but still functioning look”
Emulate? Haha
Right? Like a homeless millionaire lol
He works hard at the stuff he does. Proper presentation with a team of people to help.
@Smee Self to match or surpass. Look up sactimonious.
@@latergator9622 TIL there is an adjective for the act of virtue signaling
so beautifully explained. you are an awesome educator
Hey, I have a question. If you started this experiment in lab conditions but really really high up, would the stream ever finally oscillate into a perfect circular shape? If so I think it would prove your hypothesis!
This was the comment I was hoping to find!
I think it would end in droplets before you could see that. Maybe it's possible with fluids of different viscosity like oil..
Maybe in vacuum.
If we could make acceleration due to gravity 0 then maybe the experiment is possible
Or else the stream will just turn turbulent
@@mylittlepony7477 or split up into droplets
Quarantine day 336: "Why does my pee look like a chain?"
@Richard Joyce Ugh, Qdroids even here. Go away.
Euler's force, with the Coriolis force, makes the entangled stream known to me an Oscillating Undulation the action of moving smoothly up and down.
@@EliteGeeks is it normal?
@@MS-me6fv ( clarified.... ) to me yes...
@@EliteGeeks what do you mean "to you" ? Is it not normal to others?
Some say if you repeat "Laminar flow" three times in a mirror, Destin appear behind you...
Is there a way to run laminar flow thru snatch blocks? He’d be in heaven lol
I heard if you say it 5 times you'll find a Chinese tea pot somewhere near by
OK, I've been looking for something on this subject for yearsssss!!! Never found anything about it, so when I saw this on my recommended I knew I had to watch it
I can totally see this becoming a source of inspiration for all forms of art ( if it's not already).
"We need laminar fl-"
* Destin materializes out of thin air *
You summoned me?
YEAH XD
That and snatch blocks
Lol, I could see Destin's face Popping into the screen right when he mentioned the word "laminar"
the British UA-camr cinematic universe is getting out of hand... And I love it!
UA-cam is more incestuous than _Game of Thrones._ _Worlds are colliding! George is getting upset!_
Americans....
@@WhatColourIsYourBugatti_ living rent free in your head
I don't know why, but this video made so happy! you're delightful
thanks for this :)
Thanks for answering a question I never ask or ever thought about! 👍
"the faster you pee the longer the wave length"
That's exactly what I want to know from science courses.
EDIT: 400 likes? does that mean I’m legally in the “famous internet people” club now?
Didn`t he say it`s NOT like the faster you pee the longer the wave length..?
@@afrog2666 9:45 listen for fifteen seconds at this point.
More like beat slower. With lower angular velocity
@Hand Grabbing Fruits That's a very interesting observation! I'm guessing this person somehow got _`_ and _'_ mixed up. Because the only time you use _'_ is when there is a quote within a quote. _`_ is pretty much only used in programming languages.
@Hand Grabbing Fruits haha nice
Thank you!
I've literally Googled whether urethras are rifled.
would be nice if they were! might actually get that first second of stream into the bowl and not… everywhere else but
Ribbed for his/her pleasure? ;p
@@mduckernz you dont fuck a urethra
@@bedi3983 sounding
@@bedi3983 YOU don't fuck a urethra
Thank you for this one. Great stuff!
This man answering the important questions
Steve : To properly describe this shape, let's produce a really good example of it.
Me: Oh God! I hope he doesn't start peeing.
69 likes, nice
I hope he does
@@ThePursuitWOD You can't not expect that comment
@@ThePursuitWOD steve mould is a DILF, and I'm sorry you cant accept that
Other Science UA-camrs: here's a 3d animation explaining it
Steve Mould: I've rendered it in a copper pipe
this is the ingenuity we stay for
Oh but when I just film myself peeing and go "SEE THIS WEIRD SHAPE THE PEE MAKES" I'm "violating decency standards" and "a creep"
@@mitchh3092 i hate this LMAO
Well, he has a thing for pipes.
Sad that he didn't paint it red.
id use a chain link
That bit about getting your affairs in order had me laughing out loud. More of that sort of thing please.
Just a thought, there also is a strong correlation between the fluid flow and a gaseous flow that has also been explained as a harmonic resonance. I believe that this is a component in the steam pattern since there is a harmonic component in the body that will affect the steam follow. This flow pattern exhibits several influencers simultaneously and isn't limited to just one causel property. C
Steve-"I can't do any chores around the house without noticing physics oddities"-Mould
Idk why the algorithm recommended me this video, but honestly......not disappointed. Made it pretty damn entertaining.. I loved the doctors skit.
Same here! I guess youtube knew I was in a urge to pee
Yes love PISS
Great video. Can you do one little trick with the rinse aid study? Maybe use a syringe and inject to one side food coloring or a few sand particles. Simply out, if it's oscillating the color should stay on the same two sides with little crossing of paths. If it's actually spinning the fluid with color / dye / particles should be criss crossing from one to the next and then the next in the same direction on the way down.
Not that I don't believe it's oscillating, but I do think it would be astounding to see one side of it limited to the same two sides as further proof.
It could also be done with dividers in the container and coloring only in one that's near the edge of one. Let me know your thoughts on my lunacy, My good man, if you would please!
In order to see the flow patterns going on inside the buckled stream (as I would describe it) it would've been nice if you had added particles like glitter or something like that in combination with Slow motion filming to see what's actually going on there. I myself always thought that the shape was a spiral... Gotta love physics!
I noticed from the time I was a young adult that my stream was helical and discussed it with friends but no one else seemed to have taken any notice of their stream. I’ve always described my “anatomy “ as having rifling, like the inside of a gun barrel. I love that this video now exists. Thanks for making it Steve. Now I better go get my affairs in order I guess.
Can identify your "Inner Gun" by checking the twist on the rifling.
Reminds me of a certain someone saying they "charge rifle" peed lol.
What kind of bullets do you piss? .22? .50?
“go and have a look now” he says IMMEDIATELY after i’ve finished peeing smdh
I’m gonna sound like an idiot saying this but what does “smdh” mean?
@@kupillas-1638 "shaking my damn head"
don't be afraid to ask, even though there's so many jerks out there who'll be mean to you for not knowing something.
@@ExperimentIV aw thanks!
Instant subscribe. I’ve wondered for a lifetime. I thought something was wrong with me.
0:20 - "PUSHING water out of your body". That's interesting phrasing, but less interesting since I already found out that many people can't pee by just relaxing and letting it flow out by itself (unless they are busting). They have to actually push, to expel the liquids, otherwise nothing comes out. Now, to get the last tiny bit out, one will have to push a bit either way, so both sides have a bit of each other's situation going on to a minor degree lol. How beautiful.
1:57 "The platonic ideal of a stream of pi-" ANYWAY, moving on now
a brand new sentence for the world right there
Best part of the whole video
The platonic ideal of demonetiz-
Bahntonio> "The platonic ideal of a stream of pi-"
The correct Greek pronunciation of π is /pee/, so your cut-off is still family-friendly. 🤷
pi
"the Mould piss stream effect".
lmao yes
The Mould Effect 2: Revenge of the piss
Mouldy Pee
The mould effect - seconded.
We did it for Parker squares...
The piss effect
This man has endless curiosity.
Never change.
Hyyyyyper intéressant !
Never found explanation about this before
Thank you for answering a question I have pondered intermittently for about 60 years, often while standing out in the wilderness. How did this slit spout opening producing this chainlike stream evolve? Or was it significant for the other fluid emitted from this spout?
I think it might have to do with symmetry in our bodies. It's between your legs so it gets squeezed on the side and grows vertically due to less restraint
I was just pondering this phenomenon last month.
I think it's due to the shape of the "nozzle" and surface tension of the liquid.
@@josephsshitpostemporium4325 symmetry
@@jacobpugpoirier3350 My bad. Typo.
I actually ran into the explanation of this phenomenon when I was taking a course about fluid dynamic in college. This is the correct solution! I remembered the professor showed us a model simulation under laminar flow assumption (which apparently holds in this case as the shape is almost constant in Eulerian frame of reference).
Your professor also used a piss stream as an example?
@@sontapaa11jokulainen94
Ofc not lol. It was just a fun example of shaped nozzle.
@@mu11668B XD
Thank you explaining something I see everyday and for which I was asking myself a lot of questions… :)
I had came up with that very same explanation a while ago on the toilet, but now having it confirmed by Steve Mould I'm quite proud of myself
why not describe the shape as a chain? This 90° alternation is reminiscent of the way chain links interlock.
Yeah that makes sense.
things can have many descriptions.
I was also thinking of a chain wrapped in celophane
"Chain" is exactly what I was thinking
I came to the comments to describe this shape as a shrink-wrapped chain.
Anyone else get excited when Steve Mould appears in your notifications?
I immediately started peeing helical.
I feel like I should be but by the time it happens I keep forgetting this channel exists.
@@Slabsticktwitch I usually pee in the complex plane, a phasor if you will.
5:10 What I think. When we pour water from the container like jug. Water wants to come flows out in cylindrical shape. But when it leaves the container it becomes thin like a flat paper. Cylinder changes to flatten cylinder. And due to outward coming force this flat surface roates. And it keeps on rotating.
You can confirm this by taking a long strip of clothe hold it from one side and turn it from other side. Like do several twist.
The exact same shape will form.
I thought I was weird for having that stream... Thank you man
Helical pee streams can have disastrous effects on aim. As the pee pulls inwards, conservation of angular momentum makes it spin *faster*. When the stream breaks into droplets down the line, individual droplets sometimes end up with a lot of linear momentum. Under the right conditions, the end of the stream turns into a kind of spray.
@steve I think I can see the beginnings of this at the bottom of your helical stream demonstration, but your video just barely cuts off the breaking up of the stream.
Mmmhmmm yes, can confirm, have sprayed the wall next to my toilet many a time.
Never in my life I’ve seen anyone talk about pee in such a way
Never in my life I’ve seen anyone talk about pee in such a way
When your doctor spends his free time binging pictures of Matt Parker, you know you've got yourself a winner.
Or a psychopath
What if it wasnt his free time? Maybe Matt has issues too D:
@@SupaDanteX
Does Matt have Parker-square-shaped urine?
you mean a weiner 😂
This man is answering the real questions
Thank you, awesome video
I’ve always tried to pee harder to increase the wavelength of my pee stream. Now I know the physics, thanks Steve!
*pisses harder*
*_PHYSICS_*
@@jakkakasunset5485 MORE POWER
@@incription MAXIMUM POWER!
@@Gereon_ Elon Musk has entered the chat!
@@incription Elon Musk has entered the chat!
I've tried for years and years to find out the real reason of it and what it is called. Thank you for your perseverance!
I'm glad these videos exist because this is the type of thing I think about at 3 am but it's just slightly too weird to be considered a socially acceptable conversation
Love the captain disillusion laminar flow link!
What about when it splits up into 2 streams and makes a huge mess?
L
F
L
if you pee less hard the two streams would eventually meet in the middle and will combine into a single stream of piss
Lol idk if you are genuinely asking or just trying to be funny.. but, thats because there is semen in your urethra. Thats why it happens after sex or wetdream.
I have ALWAYS wondered this!
I just knew I'd like this video.
Laminar flow? I bet that smarter everyday will comment in less than 5 days.
he needs to get out of the submarine first.
Maybe he'll bring his #SNATCHBLOCK!
inb4 smarter everyday
Haha I had the same thought! :D
I no longer have laminar flow... Ever since I became a teenager it is all chaotic flow now.
I can't wait for this guy to get old
He's gonna be such a perfect mad scientist character
End bit was great ☺️
Steve (and also me): The shape of the water flowing matches the simulation! How satisfying!!
Everyone else: if you say so
Great video and explanation! :)
Doc, what happens when I die?
We give the bed to another patient.
You said laminar flow, Destin from smarter every day is gonna show up any second now.
I am glad you made this comment..
I thought this immediately when I saw the thumbnail. I'm happy
Ooooh yeah that rinse aid poured SO nice
This shape should be called an "oscylinder"
I thought it was a Mould Cube
Yes, "oscylinder". Good!
It's a helix.
@@peachmelba1000 Not really. It has two longitudinal planes of symmetry: it doesn't "spiral around itself". I think "oscylinder" is a fun word because it would be a cylinder (tapered, anyway) if it were not for the oscillations.
@@macronencer True. I just peed. Took notes haha
I want you to know that I watched this and subsequently spent a large portion of my son's bathtime explaining the concept to my husband using bath toys. Fun for the whole family!
i bet you are really really fun at parties. no sarcasm. i would love to hang out with u lmao
Another possible explanation for why the magnetic ring example was not a perfect model: friction between the table and magnets robbing that momentum that causes the oscillation. This would (in my mind) only have a pronounced effect if the magnets are dragging along the table rather than rolling though. So out of curiosity, are the magnets rolling or dragging as they move back and forth? Could you change that behavior with a bigger/smaller circle? More grippy magnets or a less grippy surface? Different shaped magnets? More or bigger or smaller magnets? There has to be a reason to optimize this.
The stuff about the water was cool too.
Very elegant, thanks
10:56 Doctor pretending to type picks up a phone that’s not connected to base. I love these silly jokes.
pretending to type into google image search results for matt parker
What jokes? He was in his office doing paperwork for his patients and the phone was wireless
@@nobodynowhere8061
🤣
here is the most important question : when your pee splashes, is the splash made of pee or water? what determines the composition of the splash?
Acid to water, and not water to acid
The splash is made of pee.
I brought a blacklight bulb for Halloween and out of curiosity, took it to the bathroom... the bathroom bowl was near a right angle of wall and it was speckled to hell
1. I didn’t realise pee fluoresced
2. How are you meant to clean drywall
@@halflucan that's why real man sit down to piss.
@Sam Towers I’m assuming the black light was fluorescing the dry compounds in the piss and the water evaporated
The faster something hits water, the more it behaves like a solid. To me, is like pee is bouncing off it like a rubber ball
@@halflucan never take your black light to a hotel if you ever want to travel ever again
This is what I needed to know. This.
Finally. Real answers to real questions.
It should be called "pee diamonds".
What about pee chain ?
Like shock diamonds? I can get behind this. :p
@@ewantheboat 'pee chain' sounds like 'печенье', means cookie in Russian
My cat had that. We had to feed him special food.
Kidney stones if you have a powerful stream
Medlife crisis when he finds out Steve's going to die: "oh no! Anyway"
Thanks for asking a question I’ve had for a while and not known how to ask
10:56 love that british sense of humor. It's a bit like monty phyton
Smarter everyday day: poop splash
Steve mold: pee shape
This channel has really gone in the toilet.
Cody's Lab: mercury tho?
Physics is one subject where l listen, & feel I’ve had a stroke. Each word/concept taking eons to comprehend.
It feels good to be challenged ;)
@@yakaridubois3378
yes, shark tank style
Fully enjoyed
finally a youtuber that doesnt judge the way people pee !
"The platonic ideal of a stream of pi-" oh come on man, he had me going there.
so this is The Shape of Water everyone's been talking about...
That's a 3 years old reference, but well memed regardless!
If you had two strings coming out of the orifice and the liquid was a bubble solution, could you shape the orifice such that it could spread the stream into a large bubble film? (Thus you could make a type of bubble machine with no moving parts?)
I really needed to know this