The Truth About Toilet Swirl - Northern Hemisphere

  • Опубликовано:  2 года назад
    Both videos on one page (for desktop):
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    Some notes about this.
    We each repeated the experiment 3 times, and got the same results every time. For those of you who might be skeptical, great! The good news is that right circularly prismatic kiddie pools are only $10 and you can do the experiment for yourself at your latitude. There's really no reason you shouldn't do this on your own, so before you criticize how we've done it, I'd strongly encourage you to do it for yourself.

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    Gordon McGladdery did all of the sound design for the video. We used two songs from other artists (licensed of course). Derek split the first one up so it fades from video to video, and Gordon split the instruments up on the second one. There are violins on one video and percussion on the other for example. It's really neat.

    The neat earth animation at the beginning and the synchronizing timer was made by He also made still images of the earth from the top and the bottom.

    Thanks to Jacob Vehrs for helping make the plywood pool platform.


    There was a study performed at MIT years ago ( that explained the physics involved. We repeated some of these demonstrations, but on opposite sides of the globe…and in a way that can be easily understood.
    This site is a great resource on the Coriolis effect and ways people have gotten it wrong:

    The Coriolis Effect influences the flight of a bullet.

    We would love for someone to replicate this demonstration. Please tweet your results to us @SmarterEveryDay and @Veritasium.
    Here's the link to puchase the exact same pool:

    Tweet ideas to me @SmarterEveryDay

    The thought is it will help educate the world as a whole, and one day generate enough revenue to pay for the kids' education. Until then if you appreciate what you've learned in this video and the effort that went in to it, please SHARE THE VIDEO!

    If you REALLY liked it, feel free to pitch a few dollars towards their college fund by clicking here:

    Warm Regards,

  • Наука и техникаНаука и техника
  • Длительность: 8:02
  • Smarter  Every  Day  Science  Physics  youtube edu  Education  Math  Smarter Every Day  experiment  nature  demonstration  slow  motion  slow motion  education  math  science  science education  be smart  edu science  what is science  Physics of  projects  experiments  science projects  coriolis effect  toilet swirl  australia  Coriolis  Fluid Dynamics  

Комментарии: 5 918

  • rakerholm
    rakerholm 2 дня назад

    Oh my god. This ACTUALLY gave me goosebumps!

  • PalmaKotStube :D
    PalmaKotStube :D 3 дня назад

    In Germany the water is going straight down no swirl

  • Mr Awesome
    Mr Awesome 4 дня назад

    anyone who has drained a bathtub knows this lol

  • Brew Bear Brewer
    Brew Bear Brewer 4 дня назад

    Mind blowing video! Even with just the effects of having two videos synchronized! Wow!

  • Game Kicker
    Game Kicker 5 дней назад

    Pedophile: Hey, Kid, Come over here, I got some candy!
    Kid: Yay! *eats candy*
    Pedophile: Want some more candy?
    Kid: Yeah!
    Pedophile: Follow me then!
    Kid: Okay!
    Pedophile: *brings kid to the woods then knocks him out*
    Pedophile: YES YES
    Pedophile: I GOT SOMETHING SPECIAL FOR YOU MWAHAHA *brings to school*

  • x1RoBoT3x
    x1RoBoT3x 5 дней назад

    So if I'm understanding this correctly, if this experiment were to be conducted on the equator, you would produce a portal to another dimension?

  • Tymen Vds
    Tymen Vds 6 дней назад

    this is one of the most amazing and well thought out video i have ever seen than you <3

  • Daniel Smartt
    Daniel Smartt 6 дней назад

    I'd be interested to see the same experiment done on the equator

  • daniel ramirez
    daniel ramirez 7 дней назад

    Love your channel I've got a question. Why wouldn't the water go the opposite way the Earth is rotating? You know like the force you feel in a car when going forward doesn't push you forward it sends you back in your seat. Can you please explain that to me?

  • Jonny Couillard
    Jonny Couillard 9 дней назад

    When they see the colored water they will be like what's happening there and call the police

  • Death squad
    Death squad 10 дней назад

    Spinn it the other way when you put it in

  • Gabriele Di Carlo
    Gabriele Di Carlo 10 дней назад

    Sync it up!

  • Xrexgamer1
    Xrexgamer1 14 дней назад

    I watched this on my iPad and the other on my phone

  • kiran muralee krishnan
    kiran muralee krishnan 14 дней назад

    awsome mann..!!! awsome..!! the sync video..!! dope.!!!

  • Garrek Reed
    Garrek Reed 15 дней назад

    did you not turn the valve counter-clockwise?

  • xXNeoKennyXx
    xXNeoKennyXx 16 дней назад

    First of all, I really liked this collaboration. But I have one question you did not touch. So if would put a perfect symmetric pool with the drain directly on the equator and did the experiement again. Would i technically see no rotation?

  • Mandarin Dragster
    Mandarin Dragster 17 дней назад

    yeah but y u have to put ur head into toilets ............ just let the camera do the dirty job

  • Mike Ketterman
    Mike Ketterman 17 дней назад

    You should be able to predict this in calculation. It's been years (Decades?) since I used dimensional analysis, but if it is repeatable in nature, it should be seen in calculation. Maybe your math friends could do it?

  • Danny Moore
    Danny Moore 18 дней назад

    Check this out....
    It's sooooooo cool....

  • Aditya Vijj
    Aditya Vijj 18 дней назад

    what would happen at the equator

  • Ron Hummel
    Ron Hummel 18 дней назад

    A lot of you fell for this...hahaha. They didn't open that valve all the way on that pool for a reason. It should of been parallel with the pipe. Flip valve around and that water will probably swirl the other way.

  • Jimmy Berry
    Jimmy Berry 18 дней назад

    Try this with a straight drain pipe down, no bends.

  • John H.
    John H. 19 дней назад

    No, not real

  • Adam Orick
    Adam Orick 19 дней назад

    Was that a copper drainage

  • alaskanalain
    alaskanalain 21 день назад

    Does the corriolis effect apply to hair? Which way does your hair grow, with a swirl to the left or right? Which hemisphere do you live in?

  • Ian C Boyd
    Ian C Boyd 23 дня назад

    Oh My Gosh!!! This is so cool. Please try to do more of these! If you can...It would be so much fun for the other viewers as well I'm sure.

  • Frosty Face
    Frosty Face 24 дня назад

    I Liv win Australia and it spins both ways like there is a double hurricane

  • Anastasiya Stacey
    Anastasiya Stacey 27 дней назад

    But wait.... shouldnt it be clockwise for north and anti for south?

  • Grass Snaker
    Grass Snaker 28 дней назад

    In Europe we don't have swirls at all, as we do not have lots water in toilet. Americans waste water! :D

  • Kyle Rnm
    Kyle Rnm 29 дней назад +1

    What happen in the equator? Pleae make it a video

  • Saad MAFiA
    Saad MAFiA 29 дней назад

    ent, come over here!!!

  • 8bit72HAC
    8bit72HAC Месяц назад

    Lol imagine having these videos flipped and having them look in the wrong directions at the end. That would be pretty funny

  • 8bit72HAC
    8bit72HAC Месяц назад

    This is really freaking cool

  • Marc
    Marc Месяц назад

    That was the coolest way of watching a YouTube science video I've ever experienced, exept the end xD

  • videosaala
    videosaala Месяц назад

    This is about sleep direction with respect to hemisphere!

    As a child I was told not to sleep with my head facing North (in India).. always wondered why!! Thought it was superstition... until I learn facts from experiments like yours!! Thanks for making us SED!

  • Jacques Homme
    Jacques Homme Месяц назад


    I´m a Brazilian school teacher and I´m involved to create here in my country a educational alliance based on Youtube.

    You probably won´t believe on me, but nowadays we're facing troubles with flatearthers, in the most they are creationists and b YoungEarth believers, actively trying to destroy our already poor educational level.

    I'd like to have your authorization to use parts of your video on a video-lesson I'm preparing. I have no intention of any profit with such video, but it'll be a honor to refer your excellent material.

    I hope for your authorization...

    My best regards

    Prof. Jacques Homme

  • Gator 157842
    Gator 157842 Месяц назад

    Take that flat earth

  • BrokenWatchYT
    BrokenWatchYT Месяц назад

    its creepy cus i got them in perfect sync and i put this one on the left and the other on the right.

  • Robert Nikkel
    Robert Nikkel Месяц назад

    that was awesome!

  • zog zog
    zog zog Месяц назад

    No they do not rotate in different directions. All that has happened is that you have looked at the same thing from a different point of view. Imagine this: You hold an open an faced clock in your hands. The second hand extends past the circumference of the face, it rotates clockwise. Now you turn the clock around so you see the back of it. The hand appears to rotate counter-clockwise. But it has always rotated in the same direction! Now imagine this. On the North Pole and the South Pole are two circular swimming pools with a plug for drainage in the center. You stand above the earth at a point directly above the North Pole. Because the Earth rotates in the same direction the swirl will be the same. Looked at from the other direction ie 'below' the South Pole they will appear to rotate in the opposite direction, but the swirl in the North Pool and in the South Pool will be rotating in the same direction - the same direction as when you looked from above the North Pole.

  • alberto matarrita
    alberto matarrita Месяц назад

    stupid video, not serious.

  • LMX YT
    LMX YT Месяц назад

    My toilet doesn't swirl 😞

  • j walt
    j walt Месяц назад

    That was awesome the sync was so kool

  • Krish Sanj
    Krish Sanj Месяц назад

    61k like here 62k there. 4.7k comments here and 4.8 comments there

    • Krish Sanj
      Krish Sanj Месяц назад

      2.4m view here and 2.2m view there

  • ZeR0Neon
    ZeR0Neon Месяц назад

    Did you see my comment on the other video?

  • Kieranstans
    Kieranstans Месяц назад

    This is incredible

  • Todd Krueger
    Todd Krueger Месяц назад

    okay, these videos were pretty sweet!

  • Adrian Soto
    Adrian Soto Месяц назад

    Great videos guys!!! I really enjoyed the sync.

  • rushthezeppelin
    rushthezeppelin Месяц назад

    I think same as with the average toilet or tub there are other forces that tend to do alot more for the rotation of hurricanes than the coriolis effect. You have to consider also that not all hurricanes and cyclones spin their same respective ways. One other thing, it's MUCH easier and cheaper to prove the coriolis effect with some long range shooting :)

  • Desert Lizard
    Desert Lizard Месяц назад

    how about a pool in the equator, which way will the water swirl?

  • Jon Ross
    Jon Ross Месяц назад

    You need both videos to get the whole dealm but there are still a 200k difference in view count :P

  • Terius Zúñiga
    Terius Zúñiga Месяц назад

    I add my favorite videos from you both to different playlists dedicated to each of your channels. What do I do now? Guess I'll have to comment in both videos as well xD

  • Dave Kooper
    Dave Kooper Месяц назад

    One of the best youtube gimmicks so far!

  • Noureldine Celery
    Noureldine Celery Месяц назад

    I got an ad during this

  • jchinckley
    jchinckley Месяц назад

    I subbed to both long before this (these) video(s).

    • jchinckley
      jchinckley Месяц назад

      Or maybe I didn't. I did sub long before I saw either video (of course). I was unaware that they existed, so I think maybe my first comment is incorrect. Maybe. I'm not sure.

  • prashant sharma
    prashant sharma Месяц назад


  • 薛陳月美
    薛陳月美 Месяц назад

    I'm my home my toliet just... goes.... down

  • Dedra Kuhn
    Dedra Kuhn Месяц назад

    bart simpson caused an international incident with australia over a huge phone bill because he was asking a boy there which way the water swirled

  • Masterplane!
    Masterplane! Месяц назад

    its a shame people come across these channels when new to flat earth, I can see why levels of cognitive dissonance are so high. .

  • FlareTech
    FlareTech Месяц назад

    reply to me on both videos with the same comment

  • The Moore Clan
    The Moore Clan Месяц назад

    Checkmate Flat Earthers.

  • Yuanyuan Qu
    Yuanyuan Qu 2 месяца назад

    this is cool.

  • bonsaiforu
    bonsaiforu 2 месяца назад

    I will.

  • Andre Feliciano
    Andre Feliciano 2 месяца назад

    AWESOME Video collaboration is soo dope

  • Greg Esterlund
    Greg Esterlund 2 месяца назад

    If the earth is spinning at around 700 to 1000 miles a hour, depending where you are, why can't the affect be seen outside of the car also?
    I always believed that the electromagnetism of the earth and the "left hand rule" come into play with the spin?
    Great channel, thanks

  • Lbp6 - Johnny
    Lbp6 - Johnny 2 месяца назад

    Is it just me or does anyone else not like the look of the toilet swirling clockwise? It's like an oddly unsatisfying compilation.

  • ElzearYoung
    ElzearYoung 2 месяца назад

    who else has seen the movie Escape Plan?

  • ElzearYoung
    ElzearYoung 2 месяца назад

    this collaboration made me subscribe to SED and unsubscribe to Veritasium. hit and miss

  • Eli S
    Eli S 2 месяца назад

    The sync thing is so cool.

  • Jacob Eiden
    Jacob Eiden 2 месяца назад +1

    what about a pool on the equator?

  • NeenanTheNinja
    NeenanTheNinja 2 месяца назад

    This is why...


  • mafarnz
    mafarnz 2 месяца назад

    Really cool guys, this collaboration was a lot of fun to watch!

  • Accumulator1
    Accumulator1 2 месяца назад

    This vid is BS. Toilets spin cw in the Northern Hem. unless otherwise influenced by the toilet design.

  • Robert C
    Robert C 2 месяца назад

    The real question to answer is: When drunk and you get the spins, does this apply? Also is there somewhere in the middle where you would not spin. If so there is where to open my bar! Lol

  • Therealrobokaos
    Therealrobokaos 2 месяца назад

    Since I had a video on each of my screens, when you guys switched at the end it just made you walk across my screens

  • Alex Poole
    Alex Poole 2 месяца назад

    The water in my toilet doesn't swirl :(.

  • goku21youtub
    goku21youtub 2 месяца назад

    Ican make it turn both clockwise and counterclockwise , location germany ...

  • Frankie Prokop
    Frankie Prokop 2 месяца назад

    I also got to see stillness on the Equator.

  • Frankie Prokop
    Frankie Prokop 2 месяца назад

    I was actually in Ecuador over the summer and went to the equator and got to see different swirls on either side of the equator.!

  • Outta Promotions - E.A.A (LTD) UK & WORLDWIDE

    gravity? ??

  • Kevin Mcgovert
    Kevin Mcgovert 2 месяца назад

    Probably one of the best videos Iv seen! Digging the collaboration !!!

  • Pol Verdaguer
    Pol Verdaguer 2 месяца назад

    Really cool video!

  • GamingDominari
    GamingDominari 2 месяца назад

    I can't sync the video on a fun >:(

  • Two Wheel Aussie
    Two Wheel Aussie 2 месяца назад

    So what happens when a cyclone try's to cross the equator? Does it straight away spin the other way or does it stop?

  • ano nymus
    ano nymus 2 месяца назад


  • Clickpn
    Clickpn 2 месяца назад

    i just wanna say that i NAILED the sync. NO LAG

  • cochiselol1232
    cochiselol1232 2 месяца назад

    I never realised how fucked up it would feel to look at water spinning the wrong way

  • GhostranGaming
    GhostranGaming 2 месяца назад

    This vid was amazing

  • Sasquatch McMuffin
    Sasquatch McMuffin 2 месяца назад

    But what way would it drain if you put the center of the kiddy pool on the equator?

  • Shrek
    Shrek 2 месяца назад

    Lies, i live on the equator and my toilet goes straight down

  • Quero
    Quero 2 месяца назад

    How about the hair swirls? :)

  • Uni adventures UT
    Uni adventures UT 2 месяца назад


  • Uni adventures UT
    Uni adventures UT 2 месяца назад


  • Matthew Britton
    Matthew Britton 2 месяца назад

    Hi Destin - does the direction and/or rate of flow depend on the relative position of the Earth's wobble? This affects atmospheric things that ultimately affect macro-geographical things like the Sahara Desert, but does it affect local things like toilet bowls?

  • Random Guy That Comments on Youtube videos
    Random Guy That Comments on Youtube videos 2 месяца назад

    Who actually have it in sync? This is awesome! The parts where they keep quiet are the parts where the other video starts talking!!!

  • antonio garibay
    antonio garibay 2 месяца назад

    what If your on the equator??

  • Ian Richardson
    Ian Richardson 2 месяца назад

    Physics! My favorite spectrum of science!

    • Ian Richardson
      Ian Richardson 2 месяца назад

      Mainly because all other sciences rely on it. ^v^

  • Anthony Halstead
    Anthony Halstead 2 месяца назад

    Bring this expiriment to the equator and make 2 and put one on both sides and see if they swirl different

  • millertas
    millertas 2 месяца назад

    Prof. Brian Cox said it was a myth BUT Michael Palin in his TV series 'Pole to Pole' showed a man on the equator in Kenya demonstrating the affect.

  • Xptechmike nosehairextractorguy
    Xptechmike nosehairextractorguy 2 месяца назад

    Their test was inconclusive. They didn't have enough variables. If they had Five kiddie pools one of him may have inadvertently began turning in the opposite direction. Where one direction may be a default, it wouldn't have taken much to get it going in the other direction from a stopped starting position.