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: 5 668

  • lee guankiat
    lee guankiat 9 часов 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 3 дня назад

    that was sick

  • Xanthopteryx
    Xanthopteryx 6 дней назад

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

  • Lamar Shealey
    Lamar Shealey 7 дней назад

    you have to do this it is cool

  • teo_B_boy
    teo_B_boy 10 дней назад

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

  • Joey Finton
    Joey Finton 10 дней назад

    What if you did this on the equator?

  • Ben Kissell
    Ben Kissell 12 дней назад

    This is the best vid ever

  • John Larrabee
    John Larrabee 16 дней назад

    this was genius

  • Daniel George
    Daniel George 21 день назад

    Wow that was just amazing :)

  • Tim Evanchick
    Tim Evanchick 22 дня назад

    That was super awesome!

  • Bdr Jde
    Bdr Jde 22 дня 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 22 дня 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 22 дня 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 24 дня назад

    which way does it spin directly on the equator?

  • pecfree
    pecfree 24 дня назад


  • Chad Kennow
    Chad Kennow 27 дней назад

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

  • Jayz Rhoades
    Jayz Rhoades 27 дней 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 28 дней 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 28 дней 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 28 дней назад

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

  • Christopher Smallwood
    Christopher Smallwood 28 дней назад

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

  • Enes Jashari
    Enes Jashari 28 дней назад

    what happens when the pool is in the equator

  • Brian Smith
    Brian Smith 1 месяц назад

    what happens with the swirl on the equator or poles?

  • Zephree Zen Gold
    Zephree Zen Gold 1 месяц назад

    my comment is on veritassium

  • Farinhir
    Farinhir 1 месяц 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 1 месяц 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 1 месяц назад

    brilliantly made
    Getting Smarter -(other vid)

  • Dafuq
    Dafuq 1 месяц назад

    i thougth the earth was flat

  • Hunter McFarland
    Hunter McFarland 1 месяц назад

    i live there

  • bernardakoito
    bernardakoito 1 месяц назад

    snipers knew about this for a long time

  • Koenshakuable
    Koenshakuable 1 месяц назад

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

  • Kwong Lung Ching
    Kwong Lung Ching 1 месяц назад

    Will you do the same experiment at the equator?

  • Emma
    Emma 1 месяц назад

    That was so cool!

    HOPEFOR TRUTH 1 месяц 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 1 месяц назад

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

  • shaheen eagle
    shaheen eagle 1 месяц назад

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

  • Max Davis
    Max Davis 1 месяц назад

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

  • Muhammad Zaidan
    Muhammad Zaidan 1 месяц назад

    squatting toilet> sitting toilet

  • Jørund Eldøy
    Jørund Eldøy 1 месяц 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 1 месяц назад

    the second half of

  • The Porcupine
    The Porcupine 1 месяц 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 1 месяц назад

    that was so cool when played side by side!

  • Ryo Ryo
    Ryo Ryo 1 месяц назад

    this video is creative...

  • Siberian Orange
    Siberian Orange 1 месяц назад

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

  • Alexandra M. Firebaugh
    Alexandra M. Firebaugh 1 месяц 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 1 месяц 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 1 месяц назад

    awesome video

  • mac steven de villa
    mac steven de villa 1 месяц назад

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

  • Антон Леднёв
    Антон Леднёв 1 месяц назад

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

  • Ya Mi
    Ya Mi 1 месяц назад


  • Ran dom
    Ran dom 1 месяц назад

    Children in African could have drank that water.

  • spawnage17
    spawnage17 1 месяц 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 1 месяц назад

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

  • bubmah axr
    bubmah axr 1 месяц назад

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

  • Anodos Arcade
    Anodos Arcade 2 месяца назад

    What happens if you drain it upside-down

  • Benjamin Hershey
    Benjamin Hershey 2 месяца назад

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

  • ERA
    ERA 2 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 2 месяца назад

    I saw the video on both channels

  • Daniel Auen
    Daniel Auen 2 месяца назад

    How about perfectly on the equator?

  • Mr Delaney
    Mr Delaney 2 месяца назад

    Ecclesiastes 1:6 " The wind blows to the south and turns to the north; round and round it goes."

    I love that you put bible verses at the end of your video

  • Omid Ganjavi
    Omid Ganjavi 2 месяца назад

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

  • Carmine Griego
    Carmine Griego 2 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 16 дней назад

      Kel Duck that is what they want you to think

    • Kel Duck
      Kel Duck 16 дней назад

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

    • Carmine Griego
      Carmine Griego 16 дней назад

      Kel Duck what is your point?

    • Kel Duck
      Kel Duck 16 дней назад

      Perhaps you should have watched the video

  • ToastyRoland
    ToastyRoland 2 месяца назад

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

  • Cthulu Muramasa
    Cthulu Muramasa 2 месяца назад

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

  • Michael Green
    Michael Green 2 месяца назад

    Like this so Smarterevry day to awnser this!!

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

  • Everybody90
    Everybody90 2 месяца назад

    the other side

  • Snakezombie
    Snakezombie 2 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 2 месяца назад

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

  • Rrroonald Weasly
    Rrroonald Weasly 2 месяца назад

    Perfect sync, first try. MVP.

  • instrumentalmane14
    instrumentalmane14 2 месяца назад

    Who else got dizzy at 4:33

  • Antony Theriault
    Antony Theriault 2 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 2 месяца назад

    Wrong, the direction depends on the drain.

    Dumbereveryday !

  • dilen noris
    dilen noris 2 месяца назад

    Fake news.

  • The all knowing sause
    The all knowing sause 2 месяца назад

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

  • Crazy Izzy
    Crazy Izzy 2 месяца назад

    So unfair I only have a phone to watch on

  • koplerio
    koplerio 2 месяца назад

    Sucks If I'm not able to make both go the same time. (southern Hemisphere)

  • Rohan N
    Rohan N 2 месяца назад

    hey wait what about the equator??

  • CRaSHeCLiPs
    CRaSHeCLiPs 2 месяца назад


  • Johannes Kunder
    Johannes Kunder 2 месяца назад

    The syncro was awsome!
    Pleasanton give us more!

  • Darth Chop
    Darth Chop 2 месяца назад

    YES! Thank you!

  • Mate Rodić
    Mate Rodić 2 месяца назад

    soo cool

  • mattp1482
    mattp1482 2 месяца назад

    I think you should go to the southern hemisphere and do it again.. that would be proof

  • Dartnix
    Dartnix 2 месяца назад

    One of the best ideas I've seen on youtube and very well put together!

  • Screaming Match
    Screaming Match 2 месяца назад

    Ya'll did great!

  • RCStormOrb
    RCStormOrb 2 месяца назад

    When you get the timing right first time and the videos in the right order ... YEAHAHAHAHAA

  • Dj2xP
    Dj2xP 2 месяца назад

    Hahaha, I have a dual screen setup so synching these was not hard, but I chose to put Veritasium's video on my left screen, which broke the immersion at the end :D

  • BarnabyFilibuster Jones
    BarnabyFilibuster Jones 2 месяца назад

    This is one of the best uses I have ever had for my second monitor :)

  • anonymous bosh
    anonymous bosh 2 месяца назад

    This could be faked or it could be coincidence. Either way it's an utterly ridiculous way to try to prove something that is theoretically true but in practice has been shown at least twice by universities with far more resources and patience than you to be impossible to prove or disprove on anywhere close to such a tiny scale. Attempting to do so using loose plastic kiddies pools in any old room is not only laughable but now casts serious doubt on your ability to inform us of anything with any certainty at all. Well done.

  • Oscar Jeans
    Oscar Jeans 2 месяца назад

    waiittt.... how does video have 200,000 more views?? but 1000 less likes?...

  • Evan Tee
    Evan Tee 2 месяца назад

    Watched this with dual monitor one video on each. pretty cool idea

  • WheatWormStudios
    WheatWormStudios 2 месяца назад

    Too bad you made a video without doing any research. A toilet isn't big enough to be effected by by your made up effect and that has been documented. It has everything to do with the design of your toilet. Fail

  • Wynand Henderson
    Wynand Henderson 2 месяца назад

    Very cool experiment, but I would like you to at least test 3 times at the same place and replacing the nozzle at the bottom.

  • Bron Cinzah
    Bron Cinzah 2 месяца назад

    If you understand this video i think you

  • Seán Mercier
    Seán Mercier 2 месяца назад

    Hey guys, wanted to say I've been watching both of your channels for a while now and just stumbled across this. Being from a Video making background, I found this synchronised fusion really exciting on top of your usual high quality content. Thanks for doing what you do!

  • williamstdog9
    williamstdog9 2 месяца назад

    Awesome vid(s) bro(s)!

  • DR. NEO
    DR. NEO 2 месяца назад

    the sync was amazing

  • littleratblue
    littleratblue 2 месяца назад

    If all the variables weren't cleared (and, given that one of the kiddie pools was outdoors, I'm finding that unlikely) and the results were random, then with only a single test case, there was still a 25% chance that you would get this result. You would really need to repeat it a few more times to call it science. (Though it is reasonable to think that the end result would prove the Coriolis effect).

  • Vincent Paul
    Vincent Paul 2 месяца назад

    I synchronized the video and it was very interesting.