The Truth About Toilet Swirl - Northern Hemisphere

  • Опубликовано:  2 года назад
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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,

  • КатегорииНаука и техника
  • Длительность: 8:2
  • Тэги для этого Видео:  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: 5 701

  • Sharon Hunter
    Sharon Hunter 20 часов назад

    42.448.. it swirls clockwise! Southern Oregon!!

  • Zyga Sokól
    Zyga Sokól 3 дня назад

    This test is not showing anything.

    It should be repeated many times and with the same pool with similar conditions, not two different pools.

    I'm not saying the test is wrong because it's very interesting but we only can watch cutted clip, not the whole uncuted and unedited video so...

  • mvcorse1
    mvcorse1 3 дня назад

    once u said the earth is spinning this became science fiction

  • Exner's Range
    Exner's Range 6 дней назад

    awww that was very cool!!!!!!!!!!!

  • Nithar Shana
    Nithar Shana 6 дней назад

    that was....

  • KitKatinBama
    KitKatinBama 6 дней назад


  • ᚲᚨᚢᛚᛞᚱᛟᚾ ᛃᛟᛏᛁ

    Robert Fico

  • Grant Keller
    Grant Keller 9 дней назад

    that was interesting but the Coriolis force is a atmospheric effect of freely moving air deflected by earth's rotation how does it apply to your pool drainage ?

  • Can Attal
    Can Attal 9 дней назад

    You were dropping dye in it and you claim the water to be still. And you didn't show the courtesy let us watch the experiment without a cutscene.

    What a bunch of bullshit.

  • Guja Natroshvili
    Guja Natroshvili 12 дней назад

    wow that's great even Michelson Morley could not prove earth's rotation, but you did it...

  • Chris Modisette
    Chris Modisette 12 дней назад

    Fantastic work, guys! Thank you for clearing up that issue.

  • Rafael Valle
    Rafael Valle 12 дней назад

    I put the videos on the wrong side v.v They should have warned us

  • Aryamaan Singh
    Aryamaan Singh 12 дней назад

    Put this video on left...

  • Abhinav the Human
    Abhinav the Human 13 дней назад

    anyone notice the difference in views between the two channels?

  • Armin Hierstetter
    Armin Hierstetter 14 дней назад

    Awesome job, guys!

    PS: This comment is synced.

  • Tiphanie Morgan
    Tiphanie Morgan 15 дней назад

    In this controlled experiment doesn't it matter which side of the pool you're on when you drain out the water? When the water was spinning clockwise, he was on the right hand side of the pool. The other guy in Australia who did the same experiment was on the left side when he drained out the water, causing the water to drain out counterclockwise.... Has nothing to do with the poles or hemispheres..

  • Angela Gonzalez
    Angela Gonzalez 15 дней назад

    what happens on the equator

  • Fahad Hossain
    Fahad Hossain 16 дней назад

    Guys, I love you both and both of you clearly describes complicated things

  • Geert Vis
    Geert Vis 18 дней назад

    What will the water do on the exact middle of the earth, the Equator?
    The middle of north and south?

  • OG Afghan
    OG Afghan 20 дней назад




    And its funny because Muslims claim Prophet Abraham built the "KABAA" 🕋 where Muslims submit towards it from all over the world and the Muslims who make pilgrimage there also go around the Kaaba in the same direction. And if we look at the orbit rotation & the expired stars with black holes we can see how they rotate in same old direction. Much SIGNS of science in Quran.


    ~ Albert Einstein

  • TieXiongJi
    TieXiongJi 20 дней назад

    Great pair of videos. This helped me win an internet debate, but it was already obvious thanks to the hurricanes I have seen on the Weather channel.

  • Mahesh M
    Mahesh M 21 день назад

    Antipodean Myth

  • Amet Moussi
    Amet Moussi 27 дней назад

    You recycled that water ?

  • random human
    random human 1 месяц назад

    i read it as Taylor swift 😅

  • NasToy
    NasToy 1 месяц назад

    I placed the videos on the wrong side of eachother, so the end where you go to the other guys camera, it just looked weird.

  • lee guankiat
    lee guankiat 1 месяц назад

    I am going against everyone in the world. The earth is concaved.

  • The TomFoolery Of The International Space Stage

    I recreated your experiment and failed to get a anti clockwise rotation.

    Do you really think you can detect the spin of he earth with a kiddy pool in your shed lulz?

    The "Truth" About Toilet Swirls - Destin Sandlin and Veritasium Coriolis Experiment #1

  • Brad Lamont
    Brad Lamont 1 месяц назад

    that was sick

  • Xanthopteryx
    Xanthopteryx 1 месяц назад

    Your explanation of the the coriolis effect is not quite right, unfortunately.

  • Lamar Shealey
    Lamar Shealey 1 месяц назад

    you have to do this it is cool

  • teo_B_boy
    teo_B_boy 1 месяц назад

    So if the earth wasn't rotating the water won't be spinning at all

  • Joey Finton
    Joey Finton 1 месяц назад

    What if you did this on the equator?

  • Ben Kissell
    Ben Kissell 1 месяц назад

    This is the best vid ever

  • John Larrabee
    John Larrabee 1 месяц назад

    this was genius

  • Daniel George
    Daniel George 1 месяц назад

    Wow that was just amazing :)

  • Tim Evanchick
    Tim Evanchick 1 месяц назад

    That was super awesome!

  • Bdr Jde
    Bdr Jde 1 месяц назад

    I wonder how the Coriolis effect applies to "toilet swirl" if you were to centralize the drain over one of the poles. I think it would be cool to see visualized instead of assumed or accepted in theory.

  • Harold Westrich
    Harold Westrich 1 месяц назад

    I like the way you describe it but I think you should add that in any system, like a pool or toilet, the Coriolis effect works based on THAT small system and the much larger system, of the earth, is not as effective on the tiny condensed water system. In other words; small water systems are far more effected by local motions such as momentum added through filling of the container or pulling of the plug or deflection of drain guards etc. etc, etc. My way of thinking about it is the same as you would see an ice skater spinning with arms extended, then when they pull their arms into their bodies their rotation increases greatly. It's the same way a Tesla turbine increases speed as fluid from slow outer diameter approaches the center exhaust port.

    • Harold Westrich
      Harold Westrich 1 месяц назад

      Examples of things that take advantage of Coriolis effect: Tesla Turbine, Spinning Dancers, Swimmers on inner tubes who pull arms and legs in to spin faster! Tether ball when string wraps around pole.

  • Jusonn99
    Jusonn99 1 месяц назад

    which way does it spin directly on the equator?

  • pecfree
    pecfree 1 месяц назад


  • Chad Kennow
    Chad Kennow 2 месяца назад

    This was awesome Destin! :) I can't believe I just saw this now! Thanks for all you do! God Bless!

  • Huthuswami
    Huthuswami 2 месяца назад

    have you question this MEXICO IS CLOCK WISE so IS Supposedly clock wise!
    and supposedly equator is below mexico
    so supposedly mexico shoul be the northen and anti clock wise something is really wrong, and by logic maybe north america is as well clockwise so its southern hemisphere so that MEANS EQUATOR IS ABOVE NORTH AMERicA! And Eurpoe Is Anti clock Wise So that Means Is Above! North america! wtf!!!!!!! like The falt earth map of the onu is the true one! or wtf!!!

    see the videos live of thequator
    your welcome world lol!!

  • Sp0oks00
    Sp0oks00 2 месяца назад

    Another cool effect that you can see is that in Derek's video, he's having a little more trouble with the food coloring, as its sinking straight through to the bottom. This is a clear indicator that the water in Derek's video is warmer than the water in Destin's video.

  • Rodrigo Velásquez
    Rodrigo Velásquez 2 месяца назад

    You guys should both travel to Ecuador and set two pools , one just north of the equator and the other just south, and make the same experiment. And you could add a third pool, in the very equator. And see what happens too. It should be awesome to see them at the same time spinning in diferente directions. Regards....

  • Rodrigo Velásquez
    Rodrigo Velásquez 2 месяца назад

    Simplemente espectacular... que ingeniosa idea la de los 2 videos, felicitaciones

  • Christopher Smallwood
    Christopher Smallwood 2 месяца назад

    i cant tell you how cool these videos were. well done. I loved it

  • Enes Jashari
    Enes Jashari 2 месяца назад

    what happens when the pool is in the equator

  • Brian Smith
    Brian Smith 2 месяца назад

    what happens with the swirl on the equator or poles?

  • Zephree Zen Gold
    Zephree Zen Gold 2 месяца назад

    my comment is on veritassium

  • Farinhir
    Farinhir 2 месяца назад

    Was already subscribed to you. Vertitasium got my subscription today. Like his name. Guessing it indicates something to do with truth.

    Ah, I see in the video. An element of truth. Glad i figured out at least some of it.

  • Ethan Patane
    Ethan Patane 2 месяца назад

    I experienced the change in flow rotation direction in real life. I went to the galapagos, but first stopped in Ecuador, where I went to the equator. The tour had a portable sink with him that had a removable plug in the bottom of it. He put the plug in, filled it up with water, and moved it perhaps a yard to the left of the equator. As the water drained, it spun clockwise. After it drained, he filled it back up and moved it one yard to the RIGHT of the equator. Sure enough, the water spun counterclockwise. But that's not the best part. He then filled it back up and drained it right on top of the equator. This time, when the water drained, it didn't spin AT ALL. It was really incredible!

  • ShadyNinjaGaming
    ShadyNinjaGaming 2 месяца назад

    brilliantly made
    Getting Smarter -(other vid)

  • Dafuq
    Dafuq 2 месяца назад

    i thougth the earth was flat

  • Hunter McFarland
    Hunter McFarland 2 месяца назад

    i live there

  • bernardakoito
    bernardakoito 2 месяца назад

    snipers knew about this for a long time

  • Koenshakuable
    Koenshakuable 2 месяца назад

    (cont'd from the other channel).. feeqin awesome!!!

  • Kwong Lung Ching
    Kwong Lung Ching 2 месяца назад

    Will you do the same experiment at the equator?

  • Emma
    Emma 2 месяца назад

    That was so cool!

    HOPEFOR TRUTH 2 месяца назад

    absolute nonsense the world is flat there is zero measurable curvature. vast bodies of water cannot conform to the outside of a shape in reality. water always finds level

  • Z_E_D
    Z_E_D 2 месяца назад

    Awsome Double video experience! The timing can't have been easy! =)
    Great job! and fun to learn

  • shaheen eagle
    shaheen eagle 2 месяца назад

    Well after watching like 20 videos you now have earned my subscription. congrats.👌👌👌👍👍👍

  • Max Davis
    Max Davis 2 месяца назад

    I kept watching both videos at the same time when the synchronization ended...

  • Muhammad Zaidan
    Muhammad Zaidan 2 месяца назад

    squatting toilet> sitting toilet

  • Jørund Eldøy
    Jørund Eldøy 2 месяца назад

    This explains stuff, not the swirling effect, but why the video was weird when i saw it two years ago.

  • Ananthan S Menon
    Ananthan S Menon 2 месяца назад

    the second half of

  • The Porcupine
    The Porcupine 2 месяца назад

    if I drain my bath tub and start turning the water the other way with my finger it always ends up gowing the right way in the end.

  • Cakeman
    Cakeman 2 месяца назад

    that was so cool when played side by side!

  • Ryo Ryo
    Ryo Ryo 2 месяца назад

    this video is creative...

  • Siberian Orange
    Siberian Orange 2 месяца назад

    Wow! The whole synced videos thing was amazing!!! Hope that idea catches on!! Great job guys!

  • Alexandra M. Firebaugh
    Alexandra M. Firebaugh 2 месяца назад

    But why do the actual major ocean currents and hurricanes rotate clockwise in the northern hemisphere, and vice versa for the southern hemisphere?....

  • Sam Peterson
    Sam Peterson 2 месяца назад

    I love what you guy's did with this video!!!! So smart and awesome! I've been subscribed to both of your channels for some time now... glad to see two of my most entertaining choices working together.😁 thanks guys!

  • lol 231
    lol 231 2 месяца назад

    awesome video

  • mac steven de villa
    mac steven de villa 2 месяца назад

    what happens when a hurricane from the nothern hemisphere cross the equator?

  • Антон Леднёв
    Антон Леднёв 2 месяца назад

    You should make 100 attempts for clear experiment. ^_^

  • Ya Mi
    Ya Mi 2 месяца назад


  • RAN
    RAN 2 месяца назад

    Children in African could have drank that water.

  • spawnage17
    spawnage17 2 месяца назад

    200,000 more people have watched Destin's video than Derek's video. This means that 200,000 people had no idea what was going on.

    These two videos were so freaking cool.

  • CVE
    CVE 2 месяца назад

    its the constellation of heaven/clouds, moon and the sun rotation that's causing it not the earth rotating....

  • bubmah axr
    bubmah axr 3 месяца назад

    what is this science people were so pridefully competitive about...??

  • Anodos Arcade
    Anodos Arcade 3 месяца назад

    What happens if you drain it upside-down

  • Benjamin Hershey
    Benjamin Hershey 3 месяца назад

    Protip: put Destin on the left and Derek on the right for proper orientation.

  • ERA
    ERA 3 месяца назад

    its funny now people make big deals about small things like which way the water swirls xD Why does it matter which way it goes down? Just be gratefully that it actually goes down!

  • mian  fazle razik
    mian fazle razik 3 месяца назад

    I saw the video on both channels

  • Daniel Auen
    Daniel Auen 3 месяца назад

    How about perfectly on the equator?

  • Omid Ganjavi
    Omid Ganjavi 3 месяца назад

    The way he was sticking his face in the toilet was disturbing...,

  • Carmine Griego
    Carmine Griego 3 месяца назад

    notice he put the water in clock wise thats so it would go clock wise this whole water thing is just a wives tail its just a myth its fake

    • Carmine Griego
      Carmine Griego 1 месяц назад

      Kel Duck that is what they want you to think

    • Kel Duck
      Kel Duck 1 месяц назад

      He put the water in clockwise and then the water flowed anticlockwise down the drain.

    • Carmine Griego
      Carmine Griego 1 месяц назад

      Kel Duck what is your point?

    • Kel Duck
      Kel Duck 1 месяц назад

      Perhaps you should have watched the video

  • ToastyRoland
    ToastyRoland 3 месяца назад

    Sync these videos up.. it is extremely worth it. Cheers.

  • Cthulu Muramasa
    Cthulu Muramasa 3 месяца назад

    Haven't seen the vid but I know it's the coriolis effect

  • 001011011001
    001011011001 3 месяца назад

    Like this so Smarterevry day to awnser this!!

    Whats the song that was playing durning to kitty pool?!

  • Everybody90
    Everybody90 3 месяца назад

    the other side

  • Snakezombie
    Snakezombie 3 месяца назад

    i told my friend on skype that lives in the northern hemesphere to screen share sync this up and it became wierd

  • RegularBrady
    RegularBrady 3 месяца назад

    Loved the syncing of the videos, super fun!!!

  • Rrroonald Weasly
    Rrroonald Weasly 3 месяца назад

    Perfect sync, first try. MVP.

  • instrumentalmane14
    instrumentalmane14 3 месяца назад

    Who else got dizzy at 4:33

  • Antony Theriault
    Antony Theriault 3 месяца назад

    Really cool videos guys, but geez do you not realize how hard it can be to sync two videos on the same computer?

  • Simon Ruszczak
    Simon Ruszczak 3 месяца назад

    Wrong, the direction depends on the drain.

    Dumbereveryday !

  • dilen noris
    dilen noris 3 месяца назад

    Fake news.

  • The all knowing sause
    The all knowing sause 3 месяца назад

    I am using my phone... can someone re upload this with it synchronized