The Truth About Toilet Swirl - Southern Hemisphere

  • Опубликовано:  2 года назад
  • SYNCHRONIZE WITH DESTIN’S VIDEO: bit.ly/NorthernSwirl
    Both videos on one page (for desktop): bit.ly/ToiletSwirl
    Subscribe to Smarter Every Day: bit.ly/SubscribeSED
    Click to tweet: bit.ly/ToiletSwirlTWT

    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: instagram.com/veritasium
    Patreon Support Link: www.patreon.com/veritasium
    Twitter: twitter.com/veritasium
    www.facebook.com/veritasium

    Smarter Every Day Instagram: instagram.com/smartereveryday
    Patreon Support Link: www.patreon.com/smartereveryday
    Twitter: twitter.com/smartereveryday
    www.facebook.com/SmarterEveryDay

    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 eisenfeuer.com/. He also made still images of the earth from the top and the bottom.

    Thanks to Vanessa for filming in Sydney: youtube.com/braincraftvideo

    MORE INFO:

    There was a study performed at MIT years ago (web.mit.edu/hml/ncfmf/09VOR.pdf) 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:
    www.ems.psu.edu/~fraser/Bad/Ba...
  • ОбразованиеОбразование
  • Длительность: 8:03
  • veritasium  science  physics  toilet  swirl  water  drain  northern hemisphere  southern hemisphere  coriolis effect  

Комментарии: 6 043

  • hanibal well
    hanibal well 18 часов назад

    why does smarter every day have more views by 200000 views

  • FlyBoySee
    FlyBoySee 2 дня назад

    So can we assume that if you had the very same pool at the north pole it would drain draight down? I will give 5 bucks to your patreon if you'd go there with Destin and experiment :)

  • Brew Bear Brewer
    Brew Bear Brewer 4 дня назад

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

  • x1RoBoT3x
    x1RoBoT3x 6 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?

  • BC Pratt
    BC Pratt 7 дней назад

    This experiment is not complete until you perform it at the Equator. Then you have to synchronize your equator video with these two videos.

  • daimon hellstrom
    daimon hellstrom 9 дней назад

    Don't read the comments flat earthers are desperate to hold their beliefs.

  • Gabriele Di Carlo
    Gabriele Di Carlo 11 дней назад

    Sync it up!

  • James Fernandez
    James Fernandez 12 дней назад

    Hey guys, just a quick fyi, yes, coriolis is a real effect, but alas, no one could ever prove that the earth rotates. According to Mach's Principle, the SAME effect would be experienced on a stationary earth in a revolving starfield. Imagine the starfield as a spinning tire, whose center a gravity is empty space. You can put whatever you want in that space and the tire won't touch it. This is Mach's Principle, and is it ever more valid since: 1. No test ever conducted to prove the earth rotates, or moves at all for that matter, has succeeded, and 2. Mach's Principle requires the earth to occupy a unique position in the cosmos, and ALL quanitifable and measurable observations ever conducted have led to just that. Crazy, huh? Crazy awesome.

  • kiran muralee krishnan
    kiran muralee krishnan 15 дней назад

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

  • Big Bulk
    Big Bulk 15 дней назад

    Water at the edges is faster and thus displaces the one near the center creating a vortex, what I dont understand is what determines the direction. It's not that the earth is rotating a different direction in two hemispheres.

  • Jimmy Berry
    Jimmy Berry 19 дней назад

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

  • droberts12345yt
    droberts12345yt 24 дня назад

    I am a machinist in California. We have machined a lot of water well shafts, bearings and housings. I once asked one of the older pump guys why most pumps turned counter clockwise (ie left handed threads). The only answer he could give me was that left handed pumps were more efficient. When I explained the counterclockwise whirlpool thing I think he got it.
    I wonder if all the pumps down under are right handed. Hey! Derek Do you know what direction the water well pumps turn in Australia?

  • Anand Kamlapure
    Anand Kamlapure 25 дней назад

    I appreciate that you showed the experiment in big container, but the point is, you should see in the sink and toilets too. The two sinks you show at @1:39 are just asymmetric, and then the motion is quite complicated. But if the sinks are symmetric, then you will the same effect there too.

  • Michael Teo
    Michael Teo 28 дней назад

    Inconclusive.

    I'm guessing that you have some additional footage of you leveling the surfaces... but regardless, a plywood platform is hardly reliable to be perfectly level. I'm not conviced that you've eliminated all variables. You would also need to get the creases out of the bottom of the pools, shield the pools from electromagnetic influences, perform the experiment at the same time of day or night with the sun/moon in the same point in the sky and on similar phase of the moon cycle etc.

    I would have been transparent to see the results of the other two times you ran the experiment (especially if you spent another 24 hours each time waiting for the water to settle).

  • Greg Collins
    Greg Collins 29 дней назад

    You guys are the new "mythbusters"

  • Saad MAFiA
    Saad MAFiA Месяц назад

    To read the end of this comm

  • chemistry4life
    chemistry4life Месяц назад

    Sorry I'm two years late. To be slightly more scientific, the pool should both be filled clockwise as a control, observe the results, Then repeated when filled counter clockwise and observe the results. I suppose you may have done that, but wasn't shown in the video. If yours was filled counter clockwise and destin's clockwise, one may perceive the swirl to be opposite of the direction of filling the pool

  • 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

    ruclip.com/video/GJOjRIijxwk/

    • videosaala
      videosaala Месяц назад

      Interesting.... Destin and Dr Derek!
      The link is about sleep direction with respect to hemisphere!

  • Jacques Homme
    Jacques Homme Месяц назад

    +Veritasium

    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

  • Simopr Dev
    Simopr Dev Месяц назад

    I have a question. so why the water stays stationary when the whole is sealed. You think the rotation of the earth influences the water only when its moving? how can that be explained?

    • kallewirsch2263
      kallewirsch2263 Месяц назад +1

      I agree. But the point is to demonstrate something not to proove it. The Coriolis force and what it does is known since centuries.
      Besides: in the footnote they note that every party has repeated the eperiment 3 times with always the same result. Also consider: Destin did his experiment in a garage, so no wind. Also: they filled the pool in the exact opposite direction then the expected spin direction.
      I have not done the math but I agree: the force is very low and it is easy to mess things up. I also have my doubts that this indeed is a demonstration of the Coriolis force. I too think the pool is to small for the forces to build up the vortex. But I cannot proove the opposite. And after all it is just a demonstration. We know that the Coriolis force is out there, where it comes from and what it does to the weather systems. No need to proove it.

    • Simopr Dev
      Simopr Dev Месяц назад

      thanks kallewirsch2263. I had to read what you wrote 3 times to get a sense of it. But I still think that experiment is biased. It was done once. That force is some much negligible I think. A force generated by the wind might be stronger than the one generated by the earth's rotation. And that back of water is so small to scale this theory up accurately.

    • kallewirsch2263
      kallewirsch2263 Месяц назад +1

      Because you need to have a movement towards the center. If there i no such movement then each water "particle" just moves around the earth axis on its own path. It is the movment towards the center and that each water "particle" takes with it its rotational velocity while moving to the draining hole that creates that effect. Look up the graphics near the end (the one where you look down to the pole) and it should become much more clearer.
      Keep in mind: yes, the particle farther away from earth axis is faster. But it also has a longer way around the axis. Those 2 things cancel each other so that both particles (the one nearer to the axis and the one farther from the axis) need 24 hours for one full rotation around earth axis. In fact it is pretty much the same reason of why a wheel does not fall apart even if the rim moves much faster then a part of the wheel near the center. Both parts have the same angular velocity around the axis.

  • gilbertobm
    gilbertobm Месяц назад

    What happens if you the pool right in the middle of the equator line?

  • Gail Raby
    Gail Raby Месяц назад

    I'm sure I've lost my watch.

  • Patrick Leroi
    Patrick Leroi Месяц назад

    Hmm. So the earths rotation effects water when in motion, but no evidence of that same motion it created when the water is stagnant? I call bologna... ahahaaa

  • Robert Nikkel
    Robert Nikkel Месяц назад

    that was awesome!

  • A S
    A S Месяц назад

    Interesting! A lot of time I know about the Coriolis Effect. I never read nothing that real proves it or not, in very small experiments with the rotation of the earth!
    How many experiments you need to make to real prove it? And how it works in Equator!? no rotation!? the intensity of the rotation should change with the distance to the Equator!!? You pretend that this video real proves it?
    I like a lot the way you made the experiment!

  • Kirko017
    Kirko017 Месяц назад

    Hurricanes spin counter clockwise in the southern hemisphere... All hurricanes spin counter clockwise. Flat earth confirmed.

  • I Watch YouTube
    I Watch YouTube Месяц назад

    What direction would the water flow if the drain is dead center on the equator?

    • kallewirsch2263
      kallewirsch2263 Месяц назад

      assuming you could eliminate all other influences it would not spin at all. But this is not a realistic scenario since you simple cannot eliminate everything else. As soon as some tiny spin has built up, may it be due to wind or impurities or tiny particles in the pool or wrinkles or ... (you get the picture) the spin would amplify itself.

  • ZeR0Neon
    ZeR0Neon Месяц назад

    Did you see my comment on the other video?

  • Todd Krueger
    Todd Krueger Месяц назад

    okay, these videos were pretty sweet

  • Sasha Bird
    Sasha Bird Месяц назад

    When you just watch one video by itself it just seems like someone with really bad timing made it.

  • brollona
    brollona Месяц назад

    As I remember it is Coriolis Acceleration that affects particles which move in rotating system. Those who where on mechanic, physics or similar colleges are familiar with it. I had it in kinematics and dynamics lectures and we had to calculate trajectory of particle dropped from a plane in northern hemisphere.

  • Katrina Noelle
    Katrina Noelle Месяц назад

    the coriolis effect is real but it doesnt affect things as small as toilets but when you start sizing them up and look at stuff like hurricanes and its a noticable difference

  • T Mark Hightower
    T Mark Hightower Месяц назад

    Very interesting experiment.

  • 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

  • zzz zzz
    zzz zzz Месяц назад

    yeah babe sorry, gotta go to australia for a lil bit, oh no nothing really just need to get some footage of toilets flushing

  • 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

  • siggitiggi
    siggitiggi Месяц назад

    Now I want to see this done at the equator.

  • Markoul11
    Markoul11 Месяц назад

    No, NO GO! IN ORDER THIS EXPERIMENT TO REACH VALID RESULTS IT MUST BE REPEATABLE AND REPEATED SEVERAL TIMES TO COME TO A CONCLUSIVE STATISTICAL RESULT. ALSO I NOTICED THE DRAIN PIPE IS PENDING TO A SPECIFIC DIRECTION. THAT JUST ALONE WILL PRODUCE A SPECIFIC POLARIZATION VORTEX ON THE WATER.

    DRAIN PIPE WITH THE STOP LID SHOULD NOT BEND TO ANY DIRECTION JUST LOCATED STRAIGHT BELOW THE DRAIN OPENING WITHOUT BENDING TO ANY DIRECTION. ALSO WHEN YOU DRAW THE PIPE LID TO INITIATE THE FLOW TRY NOT TO TWIST IT JUST PULL IT STRAIGHT.

    IT WOULD BE BETTER TO USE AN ELECTRIC CATAPULT VALVE (NOT A MECHANIC TURN VALVE, THESE ARE KNOWN TO PRODUCE VORTICES BY THEME SELF). YOU FAILED TO ELIMINATE ALL THE SIDE FACTORS. ALSO THE EXPERIMENT SHOULD BE CARRIED OUT INDOORS AND NOT OUTDOORS AS YOU DID. WITH NO AIR MOVEMENT, SOUNDS OR ANY OTHER MECHANICAL VIBRATIONS.

    THE SLIGHTEST EXTERNAL FORCE BESIDES EARTH'S GRAVITATIONAL ROTATION WILL INITIATE A POLARIZED VORTEX ON THE WATER DRAINING DOWN!

    YOU MUST ELIMINATE ALL THESE FACTORS BEFORE THE EXPERIMENT STARTS. ALSO TO BE MORE SCIENTIFIC WATER IF IT'S NOT DISTILLED CAN BE SLIGHTLY PARA MAGNETIC AND THEREFORE CAN BE INFLUENCED BY EARTHS MAGNETIC VORTEX. THUS BESIDES USING DISTILLED WATER AND NOT TAP WATER I WOULD SUGGEST TO COMPLETELY ENCLOSE THE WHOLE POOL AND DRAIN PIPE WITH A FARADAY CAGE.

    YOU PROVED NOTHING AND FAILED TO DEMONSTRATED THE SCIENTIFIC METHOD.

    HAVE A NICE DAY!

    • Markoul11
      Markoul11 Месяц назад

      ALSO AS A SIDE NOTE I ASSUME THE POOL WAS LEVEL USING A SPIRIT BUBBLE AND IT WAS A PERFECT CIRCLE! RIGHT?...

  • 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.

  • Lonnie Moore
    Lonnie Moore Месяц назад

    Your explanation of the Coriolis(?) effect is succinct and easily assimilated, but... How does a container with its drain way to one side/end achieve the same effect, ie, a bathtub?

  • Dedra Kuhn
    Dedra Kuhn Месяц назад

    cool video

  • Davinci Dude
    Davinci Dude Месяц назад

    Maybe the earth has no hemespheres.hmmmmmm>????

  • Masterplane!
    Masterplane! Месяц назад

    epic fail

  • FlareTech
    FlareTech Месяц назад

    reply to me on both videos with the same comment

  • Gianluca Gasparis
    Gianluca Gasparis Месяц назад

    best video ever!!!

  • Ben Gaskin
    Ben Gaskin Месяц назад

    Too much hand waving, not enough science. Anyone care to prove that the bath tub won't produce a real effect? For the toilet I believe it (too fast to get reproducible predictable coriolis effects). For the bathtub, I'd wager after some fairly random motion in the tub, waiting just one minute, the volume of water will be significant enough and the coriolis effect will work.
    The more interesting video would be to show just how easy/difficult is it to get the predicted or opposite effect from a full bathtub.

  • Andrey Nazarchuk
    Andrey Nazarchuk 2 месяца назад

    What happens if you put it in the middle of antacrctica

  • Andre Feliciano
    Andre Feliciano 2 месяца назад

    AWESOME Video collaboration is soo dope

  • Harman House
    Harman House 2 месяца назад

    I think the uneven opening acts like a propeller. It should be perfectly round and flat.

  • Argha Nandan
    Argha Nandan 2 месяца назад

    I had to continue this one at countdown 4... and after a sec, the other one at countdown 3.
    We need science to even synchronize these two videos!
    Hell yeah! SCIENCE!

  • Ross Marsden
    Ross Marsden 2 месяца назад

    Brilliant demonstration about conservation of angular momentum and the (apparent) Coriolis Force. The main reason that Coriolis is not observed in basins and toilet pans is that they are dimensionally small, and as is often demonstrated, any residual circulation indicated in the body of water dominates. The reason you both got a positive result for Coriolis - cyclonic circulation (clockwise in the Southern Hemisphere and counter-clockwise in the Northern Hemisphere) is because of the SIZE (2 metres across) of your kiddie pools.

  • swarnadipmitra
    swarnadipmitra 2 месяца назад

    Next time, I want a collab between Micheal from VSauce, Derek from Veritasium, Dustin from SmarterEveryDay and Henry from MinutePhysics because Windows 10 allows four tabs on the same screen. Can it be done?

  • Eli S
    Eli S 2 месяца назад

    The sync thing is so cool.

  • NeenanTheNinja
    NeenanTheNinja 2 месяца назад

    ...Double monitors are awesome

  • mafarnz
    mafarnz 2 месяца назад

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

  • 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

  • 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.!

  • Manish Savkare
    Manish Savkare 2 месяца назад

    how about doing this with three monitors... Veritasium - Vsauce - SmarterEveryDay

  • Aussie Soarer
    Aussie Soarer 2 месяца назад +1

    7:20 made me realize I am wasting my life watching youtube videos.

  • Jacopo Paravano
    Jacopo Paravano 2 месяца назад

    If the sink has a big hole for draining the rotatio will always be the same

  • ano nymus
    ano nymus 2 месяца назад

    Wooooow

  • alexandros domprojohn
    alexandros domprojohn 2 месяца назад

    R.I.P Phone Users

  • Clickpn
    Clickpn 2 месяца назад

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

  • Loren Ransom
    Loren Ransom 2 месяца назад

    This collaboration was so impressive!

  • Uni adventures UT
    Uni adventures UT 2 месяца назад

    Cool

  • Uni adventures UT
    Uni adventures UT 2 месяца назад

    Is

  • Jackie Shi Gaming
    Jackie Shi Gaming 2 месяца назад

    so, what will happen if you drain the pool at the equator?

  • Alexandria R. Triplett
    Alexandria R. Triplett 2 месяца назад

    Destin from SmarterEveryDay sent me here and I must say bravo guys! This is an awesome collab I feel smarter already!

  • millertas
    millertas 3 месяца назад

    The Southern Hemisphere is the best. It is on the side pointing towards the middle of the galaxy. Far more stars (including the milky way) are visible AND Christmas in summer with it still light well into the evening) especially here in Tasmania.

  • Freddie Vandyck
    Freddie Vandyck 3 месяца назад

    THIS IS SO DAMN COOL

  • Jacob Brink
    Jacob Brink 3 месяца назад

    So what happens when you drain a pool on the equator? Nothing?

  • H2TA
    H2TA 3 месяца назад

    looks good with dual monitors

  • shutemdwn
    shutemdwn 3 месяца назад

    That was cool how you synced the videos. Do some more of that!

  • justin hyland
    justin hyland 3 месяца назад

    This is an amazing video! good idea on the synchronous videos as well.
    Ive knew about the Coriolis effect, but this experiment is an awesome illustration.

  • Joseen Garcia
    Joseen Garcia 3 месяца назад

    It was way too much for my mind to process.

  • Achmad Syauqi
    Achmad Syauqi 3 месяца назад

    never been this so damn serious watching my toilet water swirling

  • Sarah Treadwell
    Sarah Treadwell 3 месяца назад

    that was soooo good!

  • xXE4GLEyEXx
    xXE4GLEyEXx 3 месяца назад

    This is...

  • roslan mat ali
    roslan mat ali 3 месяца назад

    this right

  • B Rice
    B Rice 3 месяца назад

    Cool idea, guys!

  • Dr.Evil/// Shadow hunter
    Dr.Evil/// Shadow hunter 3 месяца назад

    what was with the faces

  • ZEM pro.
    ZEM pro. 3 месяца назад

    this was a really cool idea! its awesome how you guys managed to synchronize the videos perfectly!

  • Tip Of the Day
    Tip Of the Day 3 месяца назад

    The rotation of the water is based upon the direction from which you drained the pool. Since you were to right of the pool this caused the spin to have a clockwise rotation to the right. Just as the guy in the northern hemisphere in Alabama drained the pool from the left side of the pool causing a counter-clockwise rotation. The Coriolis Effect is as real as Gravity.

  • Jeff Forsythe
    Jeff Forsythe 3 месяца назад

    Awesome videos thanks

  • Eldar Djedovic
    Eldar Djedovic 3 месяца назад

    What if you do it on the equator

  • Charlie Flor
    Charlie Flor 3 месяца назад

    ...cool

  • Ilay Morlevi
    Ilay Morlevi 3 месяца назад

    Damn! how did you manage to do that?!

  • lou crecc
    lou crecc 3 месяца назад

    Shill Nye shill

  • lou crecc
    lou crecc 3 месяца назад

    33 degrees of south latitude Freemasonry..

  • Reid Jameson potts
    Reid Jameson potts 3 месяца назад

    Would the spin or drain be faster according to disctance from each pole???

  • Zain Abdeen
    Zain Abdeen 3 месяца назад

    How about at the equator??

  • Richard Waskiewicz
    Richard Waskiewicz 3 месяца назад

    That was awesome! :D :D

  • jason of the disbury family
    jason of the disbury family 3 месяца назад

    Dont listen its fake the conditions are not the same the Container has to be the same and the plug hole has to be the same the water has to be put in the same the conditions were not the same FAKE FAKE

  • Amber Ridgdill
    Amber Ridgdill 3 месяца назад

    So then what happens directly on the equator?

  • The Big Pickles
    The Big Pickles 3 месяца назад

    Awesome vids. well done

  • Nithar Shana
    Nithar Shana 4 месяца назад

    awesome