Why Your Pee Looks Like A Chain
Vložit
- čas přidán 5. 05. 2024
- The first 100 people to go to blinkist.com/stevemould will get unlimited access for 1 week to try it out. You'll also get 25% off if you want full membership.
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
Joël van der Loo
Doug Peterson
Rashid Al M
Paul Warelis
Will Ackerly
Heather Liu
Alnitak
Twitter: / moulds
Instagram: / stevemouldscience
Facebook: / stevemouldscience
Buy nerdy maths things: mathsgear.co.uk - Věda a technologie
The bad medical advice at the end comes from Medlife Crisis. You should visit his channel here: czcams.com/users/MedlifeCrisis
The sponsor is Blinkist - The first 100 people to go to blinkist.com/stevemould will get unlimited access for 1 week to try it out. You'll also get 25% off if you want full membership.
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.
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?
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
"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 CZcams videos.
I bet the CZcams 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 (◠‿◕)
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.
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!
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: czcams.com/video/SxIkQt04WCo/video.html
The Mould liquid chain effect.
Does he have a thing about chains?
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
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.
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!
"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
CZcams nerds are the best
Wife: "What the heck are you doing in the bathroom?"
Man: "Experimenting!"
Lol
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!
so beautifully explained. you are an awesome educator
Thank you for this one. Great stuff!
“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
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
I've always wondered this! Thank you for satisfying my curiosity!
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.
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
"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"
I’m glad you’re answering the real questions
Thanks for answering a question I never ask or ever thought about! 👍
"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
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.
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
Hyyyyyper intéressant !
Never found explanation about this before
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?
the British CZcamsr cinematic universe is getting out of hand... And I love it!
CZcams is more incestuous than _Game of Thrones._ _Worlds are colliding! George is getting upset!_
Americans....
@@WhatColourIsYourBugatti_ living rent free in your head
Just straight on to the topic man!! Real professional!
I don't know why, but this video made so happy! you're delightful
thanks for this :)
"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
Other Science CZcamsrs: 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
I can totally see this becoming a source of inspiration for all forms of art ( if it's not already).
This man is answering the real 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
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
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
This man answering the important questions
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
"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.
Instant subscribe. I’ve wondered for a lifetime. I thought something was wrong with me.
Steve-"I can't do any chores around the house without noticing physics oddities"-Mould
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.
Thank you explaining something I see everyday and for which I was asking myself a lot of questions… :)
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!
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
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?
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
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.
“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!
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!
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
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
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.
Love the captain disillusion laminar flow link!
Thank you, awesome 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.
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 😂
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! :)
That bit about getting your affairs in order had me laughing out loud. More of that sort of thing please.
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
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 thought this immediately when I saw the thumbnail. I'm happy
Thanks for asking a question I’ve had for a while and not known how to ask
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’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 have ALWAYS wondered this!
Ooooh yeah that rinse aid poured SO nice
I can't wait for this guy to get old
He's gonna be such a perfect mad scientist character
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
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
Finally. Real answers to real questions.
Smarter everyday day: poop splash
Steve mold: pee shape
This channel has really gone in the toilet.
Cody's Lab: mercury tho?
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
End bit was great ☺️
"The Platonic ideal of a stream of pi--" almost made me spit my food laughing. Haha you are amazing Steve
Just FYI, it's "platonic", as in Plato, the Greek mathematician.
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
finaly somebody is asking the REAL big questions
THANKYOU FOR EXPLAINING HOW I MANAGED TO PISS IN A SPIRAL!
You said laminar flow, Destin from smarter every day is gonna show up any second now.
I am glad you made this comment..
Doc, what happens when I die?
We give the bed to another patient.
I wasn't sure if this Steve was brilliant or the maddest lad on the Tube. Then I realized he's both. I hope the follow up episode will be why your stream sometimes splits in two as it emerges or even goes off to a side.
Yes thank you
Medlife crisis when he finds out Steve's going to die: "oh no! Anyway"
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
🤣
I just knew I'd like this video.
Gravity makes it fall, surface tension keeps it in this flow patteren & magnetic field of earth determines which direction it spins. North of the equator water spins counter clockwise & water below the equator spins clockwise. Fill your sink then pull the stopper, then once it is spinning, try to reverse the spin and you will see it will change back to the direction it first spun once you stop changing the spin.
This is why the mythbusters couldn't get "peeing on the third rail" to work. I've been yelling at the screen for years now.
They just needed to drink sufficient dishwater rinse agent stuff
not necessarily:
A pee stream is not driven by gravity alone, but also by bladder pressure. Therefore the stream will not thin and break apart because of non-uniform speed across the length of the stream. If you manage to keep the break-up forces smaller than the surface tension of the stream cross-sectional area (much easier to do in laminar flow), then you should be able to prevent the stream from breaking into droplets.
Another reason the MB experiment COULD have failed would've been the "morning after" pee stream: with your stream production tool being all swollen and stiff, the equivalent diameter of the orifice is reduced enough to make the jet strong enough to make the break-apart forces stronger than the surface tension. This can manifest as a split v-shaped stream or as one that starts off as a sheet and which breaks apart further down the stream.
in other words you have 2 options:
- as MB said themselves in the episode: you can do it if you are hung like a horse
or
- if you pee like a water-jet cutter
“There are three kinds of men. The ones that learn by readin’. The few who learn by observation.
The rest of them have to pee on the electric fence for themselves.”
― Will Rogers
@@r0cketplumber lol ... did Will Rogers really say that?
I really had to laugh out loud when Rohin picked up that phone with the disconnected cord during "pretend working" ... he is such a comedic genius and his channel is suuuper interesting, personally by far my favourite medical YTer. I really like his views and approach to everything.
10:56 love that british sense of humor. It's a bit like monty phyton
I feel this is a lovely visual representation of the 3 dimensional nature of all waveforms
"The platonic ideal of a stream of pi-" oh come on man, he had me going there.
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
This is what I needed to know. This.
The shape reminds me a lot of mach diamonds exiting a supersonic nozzle. I know the phenomenon is completely different as those form due to the gas moving at supersonic speeds, but still interesting how flow appears very similarly across a variety of cases.