The Truth About Toilet Swirl - Southern Hemisphere

  • Опубликовано: 3 июн 2015
    Both videos on one page (for desktop):
    Subscribe to Smarter Every Day:
    Click to tweet:
    Some notes:
    We each repeated the experiment 3 times, and got the same results every time. For those of you who might be skeptical, great! A right circular prismatic kiddie pool is only $10 and you can do the experiment for yourself at your latitude. There's really no reason you shouldn't do it for yourself.
    Veritasium on Instagram:
    Patreon Support Link:
    Smarter Every Day Instagram:
    Patreon Support Link:
    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 Vanessa for filming in Sydney:
    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:

Комментарии • 6 216

  • Widder Willen
    Widder Willen 4 дня назад

    You didn't drain the pool in the same way. One used a plug and a small tube and the other used a larger pipe and a valve to drain the pool (I wonder if the plug, the length, the diameter of the tube/pipe and the length of the pipe would have an effect on the outcome?)
    How did you detect that the water was standing still when you didn't even see the movement and had to put the colour in to show it? Did the earth stood still while you waited 24 hours? Or does earth always rotate and the water never stood still?

  • Hoe YY
    Hoe YY 5 дней назад

    It looks like a cyclone in the middle.

  • ttmike42
    ttmike42 7 дней назад

    Flat earthers? Anyone?

  • Shamas Johnson
    Shamas Johnson 9 дней назад

    Where my Flat Earthers at?

  • 777
    777 9 дней назад

    Thumbs down: This vain experiment proves nothing to me.
    My 6 mile lake is simply not 'globe-curved' ... per my own Nikon p900 experiments. Again: NO (global) CURVATURE is on my lake.
    F-Pendulums and this may be MORE explained by flat-earth logic ... celestial object rotation(s), disk-stars above convex dome, electromagnetics of flat-earth, experimenter bias, experimenter methods, etc.
    Real eyes realize real lies. Get a Nikon p900 and do empirical studies.
    Have 55+ years of NASA globe-photos ever been validated? NO! What about photos of earth or earth+stars (double camera)? NO! Gov'ts are sinners (liars) like you and I. We need LORD + LOVE (aka JESUS).

  • Wesley Bates
    Wesley Bates 10 дней назад

    very clever and brilliantly executed

  • Douglas Ashley
    Douglas Ashley 13 дней назад

    You over complicated it. The Earth's motion is spinning the pool around in a circle.

  • sealand000
    sealand000 13 дней назад

    My toilet doesn't swirl... it's clogged!

  • Garik Spiridonov
    Garik Spiridonov 13 дней назад

    I can not even believe. Eric (such erudite people)you did not know about this effect. In every country that the equator crosses, usually near the inscription "there is an equator", somebody shows this trick. On both sides of the equator line (usually the yellow line is drawn on the asphalt) at a distance of 2 meters on the right and left, there are two tables, with holes in the center. They have buckets of water on them. The person who earns this focus money, removes the gag from both buckets. Tourists begin to run around the tables with buckets with shouts of joy and take pictures of the video, as the water turns in different directions in the right and left buckets. But I must disappoint you, the Force of Careolis does not exist, it's not Force, it's the Careolis Effect. And every sniper always takes it into account.

  • Jonha of the Huizens
    Jonha of the Huizens 13 дней назад

    funny that the australian guy uses imperial measurements and the american guy uses metric measurements

  • Seth Goodnight
    Seth Goodnight 18 дней назад

    The moment you mention the "Coriolis Effect" you invalidate yourself. The paper you mentioned never once states that the Coriolis effect is the source of the fluid's rotation, instead, this is due to the inherent vorticity a fluid has on the surface of the Earth due to its rotation. Your experiment is 100% valid, you just attributed the observations to an incorrect phenomenon. Maybe you should actually understand the paper you're shoving down peoples throats?

  • haarpWillNOTbeSilent
    haarpWillNOTbeSilent 25 дней назад

    Duping Delight everywhere!

  • maximusdarkultima
    maximusdarkultima 27 дней назад

    even this video wouldn't get through a flat earther because they... flushed all their sense of logic

  • RB Maths and Physics
    RB Maths and Physics 29 дней назад

    Definitely a nice video. A couple of comments: it would have been better to perform the experiment indoors. There are no numbers to show how small the effect really is. I came up with 10^-5 g for a medium-size sink. I have video on the channel if anyone is interested.

  • Davi Miranda
    Davi Miranda Месяц назад


  • davisx2002
    davisx2002 Месяц назад

    now do one on the equator

  • Crazykrew616
    Crazykrew616 Месяц назад

    I did the sync up and OMG was I glad I did... it was AWESOME!!!

  • Captain Smiley The Dog
    Captain Smiley The Dog Месяц назад

    I synced near perfect with just my eye.

  • Phil Indeblanc
    Phil Indeblanc Месяц назад

    STOP!! DON'T share this!!! It has NOTHING to do with rotation HELLO...its due to magnetism! polarity. You are teaching DISINFORMATION, WRONG and unfounded material that has NOTHING to do with rotation of anything. DO a test with water and magnets, and you will see that they have a polarity, very slight and WHY you had to do such a test in scale yourself. But you can do the test simply with a tube of water and magnet. Float it in a vessel and see how it reacts to the magnet. Your ENTIRE "Coriolis Effect" definition CRASHES.

  • Critical Unity
    Critical Unity Месяц назад

    The Earth takes 24 hours to rotate, so why would it have an effect?

  • Arush Bansal
    Arush Bansal Месяц назад +1

    What if we try same thing on equator

  • Stephen Snell
    Stephen Snell Месяц назад +1

    The coriolis effect has no effect on a toilet at all

  • 0MindSwept0
    0MindSwept0 Месяц назад

    I only watched this video by the way...

  • leon witteman
    leon witteman Месяц назад

    This is SO worth it! I enjoyed it a lot! You guys are awesome, when you concluded on the (ant)arctic pool draining (5:30) the pause between "swirls" and "clockwise" was precisely long enough for Destin to say "anti" and "clockwise" remaining synced. Please tell me you didn't need to cut the audio track while editing ;). Still, just great!

  • Tamás Dedinszky
    Tamás Dedinszky Месяц назад

  • Saswat Sarangi
    Saswat Sarangi Месяц назад

    Isn't it a bit harsh to say if we hadn't subscribed his channel what we had been doing with our lives?

  • Roger Zibell
    Roger Zibell Месяц назад +1

    The scene with the mixed results.... The common sink side by side. The drain for both sinks is no doubt going into one pipe under the sink. Both sinks also share a common vent. The mixed result is the result of the common drain and vent. The water draining from one sink will interfere with the draining of the other sink. If the drain and vents were not common, this would not happen. Attach the left and right drain to separate pipes and separate vents...... you will find that the each sink would drain the water in the same direction every time.

  • Phil Rabe
    Phil Rabe 2 месяца назад

    I understand that the flat earthers don't believe in water, so this experiment won't help them figure out their larger misunderstanding.

  • J Rob
    J Rob 2 месяца назад

    You can't do it one time and call it conclusive.

  • Loren Saunders
    Loren Saunders 2 месяца назад

    FREAKING BRILLIANT!!!! THANK YOU!!! (I'm yelling on purpose)

  • Willie Koorts
    Willie Koorts 2 месяца назад

    How cool is that! Two guys I'm subscribed to, doing a totally controlled experiment together, with an awesome result, challenging another guy who I'm also subscribe! Great video guys, particularly when playing them synchronised! I suspect you are correct, this has not been done on the internet before! Keep up the great work!

  • Trans Sporter
    Trans Sporter 2 месяца назад +1

    Toilet swirl is usually initiated by angular water nozzles located under the rim which will overpower any minute Coriolis effect.

  • LifeUnder TheMicroscope
    LifeUnder TheMicroscope 2 месяца назад +1

    Two turds.

  • Christina Bauer
    Christina Bauer 2 месяца назад

    I don't know which is more awesome, the experiment or that you did this together and planned it to show at the same time. My husband and I just watched them together and it was great! Definitely sharing the awesomeness with friends.

  • Elia Maracani
    Elia Maracani 2 месяца назад

    What do you think about what is shown in this video on Facebook about the same phenomena?

  • Minh Trinh
    Minh Trinh 2 месяца назад

    Just for some clarification you did notice a small effect, but over a long period of time. What kind of period of time needed to pass in order for their to be an noticeable effect?

  • Steven Johnson
    Steven Johnson 2 месяца назад

    What happens if you do the experiment exactly on the equator? Will the water go straight down with no spin?видео.html

  • Joel Harris
    Joel Harris 2 месяца назад

    Just remember to do the test with an unused toilet.

  • jazeets
    jazeets 2 месяца назад

    The size of the bath tub is exaggerated---I am not sure if this 'lagging behind or getting ahead' business is significant in such a small tub.I don't know how to reconcile this with another video by a Kenyan on the equator, showing clockwise rotation in a bowl a few feet north of equator, and anti-clockwise rotation a few feet south of the equator.

  • Sanjay Bhowmick
    Sanjay Bhowmick 2 месяца назад

    Amazing how you can say that the effect of the phenomenon is tiny and that it can be seen in flushing toilet (water jets) in the same breath!

  • Prashanth K S
    Prashanth K S 2 месяца назад

    Now this is one incredible pair of videos. No wonder you both are my fav youtube creators!
    What I'd love to see now is you both team up with Physics Girl and get her to do the recording right on the equator. Now that'll be something, ya?
    ...just that I don't want to wait 5 years now for the 3 of you to sync up. And I'm wondering about the logistics of playing 3 videos side by side by below??
    Ooo... lookie, while you both were making synchronized videos, here is my synchronized comment! Clicking the comment button in 3..2..1.

  • Ted Grassman
    Ted Grassman 2 месяца назад

    This is probably the craziest thing I've ever seen on RUclip! My mind is blown! How come I only discovered it now? Must be the normal-looking title, hiding one of the most original and well edited dual-video experience :D
    Well done, sirs!

  • ap koiv
    ap koiv 2 месяца назад

    Veritasium video: 2,424,228 views
    SmarterEveryDay video: 2,641,421 views
    At least 217,193 viewers are rebels and don't adhere to the rules. Go you. Yea... SMH !

  • Matt Pipp
    Matt Pipp 2 месяца назад

    I can't see how you would get you pool sitting so perfecly that there would be no 'outside' influences

    • elonesnah
      elonesnah 2 месяца назад

      Matt Pipp
      The water cant go other ways in this experiment, and lots of other experiments shows the same effect.

    • Matt Pipp
      Matt Pipp 2 месяца назад

      elonesnah that's my point. When the water goes the way you think it should, it's set up correctly.

    • elonesnah
      elonesnah 2 месяца назад

      Matt Pipp
      Focault pendulums shows same effect, hurricanes show same effect, star trails show same effect pointed at the two celestial poles, eotvos effect shows same....

    • Matt Pipp
      Matt Pipp 2 месяца назад

      Kel Duck Right. Not sure how a kiddie pool on top of a piece of plywood falls in line with that. My impression is, they know it's 'set-up' correctly when it spins the way they think it should. That's all.

    • Kel Duck
      Kel Duck 2 месяца назад

      Build a strong level foundation, a bit like most buildings in the world.

  • anmol gupta
    anmol gupta 2 месяца назад

    wow it was awesome seeing both at the same time

  • Boris Popovich
    Boris Popovich 2 месяца назад

    This doesn't prove the globe or the spinning. It can be a moving magnetic field or whatever force that's moving the sky and everything in it above the Flat Earth! You can prove the globe only by taking a picture of the entire thing, and you can prove the spin by making a video of it spinning. Everything else is a theory. You got overexcited too soon.

    • elonesnah
      elonesnah 2 месяца назад

      Boris Popovich
      But the earth rotate very slow, only once in 24 hours, or 0.000695 Rpm, speed is relative, if you were a giant holding the earth in your hand it would still only rotate once in 24 hours.
      Focault pendulum, eotvos effect, hurricanes opposite rotation in the two hemispheres, star rotation opposite in the two hemispheres, eotvos effect, tracking the sun and stars with an equatorial mount using only one axis of rotation, the suns movement is 15 degrees every hour due to the earth rotation, no matter from where on earth you measure it.. All impossible on a flat stationary earth.
      So what evidence of no rotation you got?.

    • Boris Popovich
      Boris Popovich 2 месяца назад

      Kel Duck I am not claiming anything. I am disputing their claim. There is no evidence that we live on a spinning ball. If we were truly spinning, the oceans would be long gone.

    • Kel Duck
      Kel Duck 2 месяца назад

      So you are claiming its a "whatever force", wow magic.

  • Vikash Pratyaksh
    Vikash Pratyaksh 2 месяца назад

    Then how about swirl direction at North and South poles. In which direction will they rotate

    • elonesnah
      elonesnah 2 месяца назад

      Counter clockwise and clockwise.

  • jeff Webb
    jeff Webb 2 месяца назад

    It also depends on how the water in a toilet mechanism is designed and on what side of the bowel it drains to. Better off using a sink.

    • Kel Duck
      Kel Duck 2 месяца назад +1

      Watch the video, that way you wont look so stupid.

  • G W
    G W 2 месяца назад

    Your channel is just fantastic to watch - You get smarter every day!!!! Greetings from NZ

  • Ivan Sin miedo
    Ivan Sin miedo 2 месяца назад

    Min 3.53 is such a beautiful picture!

  • Hen Hen 601
    Hen Hen 601 2 месяца назад

    Corriolis effect is so fascinating and makes sense : )

  • Emppu T.
    Emppu T. 2 месяца назад

    Now i need 2 youtubes open on my phone

  • sometimesgood
    sometimesgood 2 месяца назад

    I came from SmarterEveryDay! This was awesome!! :)

  • SCLS
    SCLS 2 месяца назад

    They could just edit the videos side by side in one video but noooo

  • Markus Wolf
    Markus Wolf 3 месяца назад

    Just subbed based on Toilet Swirl and Dustin's recommendation. Also, I had the videos on the wrong side of the screen, so you exited the wrong way but showed up on the other side like pacman.

  • Daniel Lancaster
    Daniel Lancaster 3 месяца назад


  • Aidan S
    Aidan S 3 месяца назад +1

    My desktop will only play one video at a time. Dammit

    • warpatato
      warpatato 5 дней назад

      Bro I think it's time to replace your potato.

  • Rickvian Aldi
    Rickvian Aldi 3 месяца назадвидео.html
    hey, this is great experiment!
    gotta try this because sometime in holidays i return to my home town at pontianak

    OMG OMG 3 месяца назад

    Synced video:

  • Megha Telang
    Megha Telang 3 месяца назад

    feeling like a boss. watched 16 minutes of content in 8 minutes.!!!

  • miguezscience
    miguezscience 3 месяца назад

    Science Teacher. Wrong. Coriolis Effect has an effect on large systems like wind and hurricanes not toilets. Please check the facts.

    • elonesnah
      elonesnah 2 месяца назад

      Do you see any toilets in the video?.

  • Tricken87
    Tricken87 3 месяца назад

    I know this video isnt new but that was still cool watching both synced videos like that.

  • Mustafa Süzen
    Mustafa Süzen 3 месяца назад

    This is really good work. I never seen any video like you do. I subscribed both of your channels. Can you make more sync videos?
    This two sync videos are pretty awesome, like watching one video in two separate monitors.

  • Samuel Fend
    Samuel Fend 3 месяца назад

    These videos should actually have the same amount of views

  • DWS Outdoors
    DWS Outdoors 3 месяца назад

    I just seen this now and you guys get an A+ for making science as cool as this collaboration is! My inner nerd was giggling with excitement with how good the synchronization was!

  • BGMA
    BGMA 3 месяца назад

    Link for synced up videos:

  • Alexander Balesini
    Alexander Balesini 3 месяца назад +1

    Haha, I have the exact same comment on the other side!

    PHSL KSA 3 месяца назад

    this is awesome !

  • Jonathan Shafer
    Jonathan Shafer 3 месяца назад

    So awesome with two monitors! i love the synced video! very cool!

  • Rui Cruzeiro
    Rui Cruzeiro 3 месяца назад

    Check this video out:видео.html
    On the girl's sink, which is small, the Coriolis effect is much more noticeable.
    Great channel!

    • Kel Duck
      Kel Duck 3 месяца назад

      There is a major issue with how she pored in the water, why did she pour it in off centre when she needed a whirlpool.

  • dereklacy
    dereklacy 3 месяца назад

    long time smarter subscriber and now I'm sub'd here too!

  • Xanthopteryx
    Xanthopteryx 3 месяца назад

    That's not the correct explanation of Coriolis effect.

  • Juan David Santamaría Sánchez
    Juan David Santamaría Sánchez 4 месяца назад


  • psydwaindah
    psydwaindah 4 месяца назад

    847 flat-tards took umbrage at this video! If we flushed them down a toilet which way would they swirl before they gurgled into oblivion?

  • John Johnson
    John Johnson 4 месяца назад

    Great simple example to debunk flat earth theorist

  • Feanor K
    Feanor K 4 месяца назад

    Do a video that teaches some science to flat Earthers please!

    • Kel Duck
      Kel Duck 3 месяца назад

      That is really an impossible challenge. You would have to start at kindergarten level and then there would still be problems.

  • Bishop Racicot
    Bishop Racicot 4 месяца назад

    we want more!

  • Lavuvzu Surat
    Lavuvzu Surat 4 месяца назад

    This is a lie.

  • Lampardi Phosphorous
    Lampardi Phosphorous 4 месяца назад

    Damn im on my phone

  • Hyacinthe1969
    Hyacinthe1969 4 месяца назад

    Great job guys! Thank u both for ur efforts to help teach the world! :)

  • Sani R.
    Sani R. 4 месяца назад

    whole video(s) gave me chills.. i felt very sciency aligning to videos and sync it. awesome video(s).

  • DoodiePunk
    DoodiePunk 4 месяца назад

    I still don't understand, was there a difference from the southern hemisphere?
    I watched the video twice, but I still can't understand!

    • Kel Duck
      Kel Duck 4 месяца назад

      It spins in different directions depending on the Hemisphere.

  • slaptoad
    slaptoad 4 месяца назад

    Hello from the other side, I must've subscribed a thousand times

  • phychmasher
    phychmasher 4 месяца назад

    That was so fun, thanks for the effort!

  • arno kosterman
    arno kosterman 4 месяца назад

    It spins in the same way than the planet even the tree s have a spinn

  • arno kosterman
    arno kosterman 4 месяца назад

    Strange that on quantum lv everyting spins the same way .
    Like the spinn Puls mather

  • Ju ch
    Ju ch 4 месяца назад

    Marvelous executed

  • Ziggurat XYZ
    Ziggurat XYZ 4 месяца назад

    That synchronisation experiment was absolutely fantastic.

  • Nitish Srivastava
    Nitish Srivastava 4 месяца назад

    What if I'm already happily subscribed to both of you?

  • That one Moon Base Alpha player
    That one Moon Base Alpha player 4 месяца назад

    What about at the equator

  • A. Cesário
    A. Cesário 4 месяца назад

    Amazing video! Congrats.

  • Khalis Suhaimi
    Khalis Suhaimi 4 месяца назад

    (go to destin's video for the beginning of this comment)...ARE AWESOME!!!!!!

  • Matt
    Matt 5 месяцев назад

    What foolishness. The guy did the experiment ONE TIME. True science requires the experiment to be done several times. Was the pool on perfectly level ground? He didn’t take that into account. Here’s one more thing, which way does the water drain at the poles? I guarantee that it would spin in either direction. Everyone in here is congratulating this guy but no one thinks for themselves. Sheeple.

    • Kel Duck
      Kel Duck 4 месяца назад

      Well most people read the description, they then find it was done 3 times each, so 6 times all up.
      Explain how non level ground will effect the rotation of the water?
      Your guarantee is worthless.

  • *User.Aaron*
    *User.Aaron* 5 месяцев назад

    where you at Southern flat-earthers

    • Kel Duck
      Kel Duck 4 месяца назад

      No FEers down here, we have education.

  • Wrench TV
    Wrench TV 5 месяцев назад

    I can make a washing machine now

  • Jack Fredricks
    Jack Fredricks 5 месяцев назад

    This video has more up votes and a few less down votes, yet the other has more views.

  • josorr
    josorr 5 месяцев назад

    At the time of this post, (10:15p.m. CST January 13 2018) Derrick (Veritasium) has 2,353,129 views and 64,458 likes. Destin (SmarterEveryDay) has 2,593,141 views and 63,781 likes. So, Destin has more likes, but Derrick has more views.

  • Shaun Villar
    Shaun Villar 5 месяцев назад

    So does a real clock run slower in the northern hemisphere? Surely it does as the same force directing the swirl in the water will have an effect on the hands on the dial?

  • Sastkryptlox
    Sastkryptlox 5 месяцев назад

    Incredibly awesome idea - one of the best RUclip collabs I have ever seen!!