The Truth About Toilet Swirl - Southern Hemisphere

SYNCHRONIZE WITH DESTIN’S VIDEO: http://bit.ly/NorthernSwirl
Both videos on one page (for desktop): http://bit.ly/ToiletSwirl
Subscribe to Smarter Every Day: http://bit.ly/SubscribeSED
Click to tweet: http://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: http://instagram.com/veritasium
Patreon Support Link: http://www.patreon.com/veritasium
Twitter: http://twitter.com/veritasium

Smarter Every Day Instagram: http://instagram.com/smartereveryday
Patreon Support Link: http://www.patreon.com/smartereveryday
Twitter: http://twitter.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 http://eisenfeuer.com/. He also made still images of the earth from the top and the bottom.

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


There was a study performed at MIT years ago (http://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:

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Автор Melvin Duckenfield ( назад)
At 4:08 he states, "So really you're not gonna see it in a bathtub and you're not gonna see it in a sink or in a toilet because there are other sources of angular momentum that totally wash out this effect." What are those sources? It appears to me that there are multiple variables to be considered before one can definitively "prove" the desired conclusion. Additionally, only one experiment was done. Can we draw a definitive conclusion based on one experiment? Could the direction of the air current above the pool, since it was outside, have affected the direction in which the water drained? Were both platforms identical and completely level? I would be more inclined to consider his conclusions if he and his partner had repeated their experiments multiple times under various conditions and in various locations in the respective hemispheres to prove their hypotheses. Isn't that what the scientific method is all about?

Автор Cody Deforest ( назад)
That was cool guys

Автор Zephree Zen Gold ( назад)
great team work see my comment on smarter everyday

Автор mike nguyen ( назад)
the screen warp was pretty sick

Автор DMatthewHenry ( назад)
This was really freaking cool.

Автор ShadyNinjaGaming ( назад)
Brilliantly made
(other vid) - every day

Автор jakub Kraus ( назад)
Too bad the Earth is obviously flat...


Автор Koenshakuable ( назад)
that was... (on the other channel)

Автор HOPEFOR TRUTH ( назад)
what a load of nonsense

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

Автор ? ¿ ( назад)
cringy end

Автор daniel hoad ( назад)
this is to much effort to know which way a toilet flushes

Автор Robert crowdiver Burns ( назад)
horseshit,, it does the same up north !

Автор Ananthan S Menon ( назад)
this comment is here.
find it

Автор Ryo Ryo ( назад)
this video is creative...

Автор Sam Peterson ( 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!

Автор lol 231 ( назад)
awesome video

Автор Ya Mi ( назад)

Автор Sean Freeman ( назад)
that was dope af

Автор Mahbub notoshu ( назад)
i watched both videos chronologically on a single screen, one video after the other, so the real drain happens on my brain.

Автор Benjamin Hershey ( назад)
Protip: put Destin on the left and Derek on the right for proper orientation.

Автор Connieisland0 ( назад)
This is video is so misleading and untrue. It throws the scientific method out the window.
Water spins according to the shape of the drain, its immediate surrounding. Sadly the masses will be believe a video like this more than making the experiment themselves.
If people think that earth rotation is detectable by no other instruments but a simple water flow going down a drain, then they should really do a check up with the reality around them.
There are no instruments that ever detected the rotation of the earth, however you're telling us that water going in a drain gets affected by this so called rotation??

Автор Сергей ( назад)
In my bath it always swirls in one direction. Even if i try to change the swirling direction with a stick or smth like that, water changes the direction again to the initial one after a minute or so.

Автор ToastyRoland ( назад)
Sync these videos up.. it is extremely worth it. Cheers.

Автор Cthulu Muramasa ( назад)
Just learned this in science

Автор Cthulu Muramasa ( назад)

Автор Cthulu Muramasa ( назад)
It's the Coriolanus effect

Автор bleuthoot ( назад)
This is the ultimate way to collaborate

Автор Everybody90 ( назад)
hello from

Автор Sirake Wizen ( назад)
Damn, I'm already subscribed to both :(

Автор D-Schloss the boss H-town rowlin hard ( назад)
how did you know i put you on the right

Автор RegularBrady ( назад)
Loved the syncing of the videos, super fun!!!

Автор Rrroonald Weasly ( назад)
Perfect sync, first try. MVP.

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

Автор koplerio ( назад)
time same the go both make to able not I'm If Sucks. (northern Hemisphere)

Автор CRaSHeCLiPs ( назад)

Автор Mate Rodić ( назад)
soo cool

Автор Dartnix ( назад)
One of the best ideas I've seen on youtube and very well put together!

Автор Screaming Match ( назад)
Ya'll did great!

Автор Dj2xP ( 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

Автор Ali Tahrei Sh. ( назад)
What about equator?

Автор qwchrbichn ( назад)
The truth about toilet swirl is that toilets force the water in one direction or another. The side-by-side sink comparison is hardly surprising. A better side-by-side comparison would be ones with drains in the center of each compartment.

Автор Barnaby Jones ( назад)
This is one of the best uses I have ever had for my second monitor :)

Автор Liza Marie Rios ( назад)
omg you guys are awesome.

Автор Bron Cinzah ( назад)
're amazing ...if you follow this you're Genius...

Автор FuckYouGooglePlus ( назад)
This is jus silly. A 12 foot pool is NOT showing off the Coriolis effect. The effect on something that small would be way more than canceled out by imperfections in the pool itself. Like not being level, or any deviations from roundness, etc. Even imperceptible wind.

Автор silikonmanufaktur ( назад)
Wow, didn't think it would really work ! Amazing. Did you try several times to make sure it wasn't just a lucky coincidence ? Best way to do it would be using several pools at the same time, to make sure no tiny asymmetry in the outlet, the valve, the plug etc determines the direction of the rotation. Because that might easily be the case, considering the incredible tiny difference in angular momentum we are talking about. And air has a lot less friction compared to water, while the distances covered by those storms are hundreds of miles ! I must confess i would have bet money on you guys failing to show the coriolis effect in a kiddie pool ! Congrats and well done ! :-)

Автор Tej Pal Singh ( назад)
all my favourite people in one video.

Автор jon pounders ( назад)
why didn't you guys do the same test in the northern hemisphere to make this study complete?

Автор Seán Mercier ( 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!

Автор DR. NEO ( назад)
the sync was amazing

Автор Vincent Paul ( назад)
I synchronized the video and it was very interesting.

Автор Brian Killough ( назад)
could we place something low that would hardly if not at all be affected by wind to flow to a specific spot in the ocean? Is the pool and the hole in perfect symmetry and perfectly level?

Автор Death_Kenny ( назад)
Got it timed perfectly first try... Really amazing Idea of you both! Loved it!

Автор Maven Sony ( назад)
Now do this experiment in exactly midpoint of equator .Lets see what happens..

Автор znatim ( назад)
You could mention Foucault experiment

Автор sharan kaur ( назад)
Happiness when u r subscriber of both channels 😆

Автор kuonirat ( назад)
Now I can impress my female colleague, who claimed otherwise.

Автор Southern Hemisphere ( назад)
Name stealer :(

Автор Strike Eagle ( назад)
Im subbed to him but i still dont know what i am doing with my life

Автор Strike Eagle ( назад)
That... Was... AWSOME! The 2 vid idea was crazy cool!

Автор MrG ( назад)
what a great idea! You both are awsome guys. I allways said the internet is a huge dunghill where here and there thrives a flower. You are these flowers I was seeking. Stay smart and above all, stay curious.

Автор zazke girotron ( назад)
hey this is cheating: 2 views at the same time per person... well played

Автор oceanceaser ( назад)

Автор Dean Stewart ( назад)
Champion effort guys

Автор mrcleanisin ( назад)
I haven't read all the comments, but surely someone asked them why they didn't repeat the expirments more than one time?

Автор Roan Wilkins ( назад)

Автор Mohamad Zaid ( назад)
nice..i did sync both video with two monitor. haha burnn

Автор ANDROID GAMING ( назад)

Автор Al-mujahedeen Salahadeen ( назад)
SmarterEveryDay brought me here!

Автор MWB Gaming ( назад)
1:32 you are not here in AU
our power outlets look like an arrow not like the face of someone getting probed

Автор dan hewitt ( назад)
Who else subbed from smarter every day? Great channel btw? I like ur vids alot. 😊 peace from the UK

Автор farooq shaik ( назад)
Open Two tabs and cascade

Автор Abodimax Alrashdi ( назад)
what will hAppen if you. we're on the. equator

Автор Gabri Janse van Rensburg ( назад)
This was so cool. I got it to sync up exactly on my first try. You guys are awesome.

Автор Dj Otsirave ( назад)

Автор Agusta Motor ( назад)
That is also the reason why australians drive clockwise on roundabout, and Americans drive anti clockwise

Автор EmeraldGaming ( назад)
Too bad this doesn't work on mobile

Автор gmeast ( назад)
yeah ... I figured this out on my own in my 1965 high school physics class. What's the big deal?

Автор MinerQuick ( назад)
Wow that was Impressive 2 vid in 1

Автор Michael Scofield ( назад)
Awesome project guys, loved the synced videos

Автор Abishai Singh ( назад)
Really creative way of collaborating and I was fun watching both the videos simultaneously in 2 different tabs. Hope to see more vidoes....

Автор pietersrv ( назад)
So there IS an effect!

Автор Sasami R Conway ( назад)
so cool

Автор Kristjan Niiberg ( назад)
awesome guys!!!

Автор ThePiGuy24 Gaming ( назад)
This is an awesome half video.

Автор Coffee King GT ( назад)
read my comment on the other vid

Автор Enchanter 101 ( назад)
i sync it

Автор Derrick Wesonga ( назад)
I had it perfectly synced then about 4 minuites YOUTUBE had to show me an AD on one video :(

Автор Leonardo Nerio Benavides ( назад)
What if you plug it straight in the middle of north or South Pole, does it go out without spinning?

Автор TheFalconLord ( назад)
I like how these two awesome channels are trying to help each other get views XD

Автор A Duck ( назад)
ʕoɘbiv ɿɘʜɈo ɘʜɈ no ʞool lliw Ɉnɘmmoɔ ƨiʜɈ woʜ ɿɘbnoW

Автор Devilmonkey ( назад)
strange how Veritasium used the term 5' foot wide (in a metric country) and Smarter every day used 1.5 meter (in an imperial system country) as their units of measurement.
This is why we crash space probes people!
Just thought it was odd.

Автор Seanisawesome000 ( назад)
Brendon wish me luck!
Other video: good luck derek!

Автор LadyClove ( назад)
What about imperfections in the drain that would pull one side of the water down miliseconds sooner than the other side. Maybe the true test in the Southern Hemisphere would be to get the water flowing counter clockwise by your hand then stop and see if the direction changes to clockwise on it's own.

Автор Chun Wei Lin ( назад)
So...., the toilet swirl in southern hemisphere is rotating clockwise and the northern swirl is rotating counter clockwise(no doubt), but what make this? The Earth's magnetic field or Coriolis Effect?

Автор anjali amrutkar ( назад)
you do very much hard work for making these videos and this is the real reason Physics seems easy when seeing your videos...Physics made simple Great Work :-)

Автор Ира Авраменко ( назад)
So what happens on the equator?

Автор Potato _ ( назад)
5:43 you said that water spins CLOCKWISE in the SOUTHERN hemisphere, but doesn't it actually spin clockwise in the northern hemisphere??

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