The Coriolis Effect Test: two hemispheres, one sink

The Coriolis Effect Test: two hemispheres, one sink

Disproven! The Coriolis Effect does not make the water drain out a sink anti-clockwise in the Northern Hemisphere and clockwise in the Southern.

Have you taken the same sink to both hemispheres? If so: send in your data to add to mine.

Northern: Clockwise, clockwise, clockwise, clockwise, clockwise.
Southern: Anti-clockwise, anti-clockwise, clockwise, anti-clockwise, clockwise.

SmarterEveryDay: The Truth About Toilet Swirl - Northern Hemisphere

Veritasium: The Truth About Toilet Swirl - Southern Hemisphere

Thanks to my Patreon supporters who made this possible! Here are a random subset:

Ben White
Jade Bilkey
Scott Robinson
Amy Sandland
Mikko Manninen

If you’re wondering how I transported the sink from one hemisphere to the other: that is covered in the Patreon behind-the-scenes footage for this week. Support me on Patreon for as little as $1.11 and get access to all bonus content.

Huge thanks to Trent Burton who filmed the video in London, Simon Wright who filmed the Sydney footage and Jen Rogers who was the on-site runner and statistical consultant. Trent then nearly died trying to do the edit.

The sink was donated to a recycling centre in Sydney. It was last seen by the front door of Reverse Garbage (Addison Road, Marrickville, NSW). If anyone wants to buy the sink, it may still be there! If anyone checks on the sink let me know if you find it or not. Last known photo of the sink:

CORRECTIONS:
- It sounds like I say "Dustin" at one point instead of "Destin", sorry about that. I got the wrong name wrong.
- Let me know if you spot anything else!

The photo of Earth was taken on 6 July 2017 by the Deep Space Climate Observatory (DSCOVR) satellite. Image by NASA.

Northern Hemisphere anti-clockwise storm is Hurricane Katrina from 2005. Image by NASA.

Souther Hemisphere clockwise storm is Cyclone Debbie from 2017. Image by NASA.

Music by Howard Carter
Design and filming by Simon Wright
Filming and editing by Trunkman Productions
Additional help by Jen Rogers

MATT PARKER: Stand-up Mathematician

[BrandonFrancey]

Okay, I'm convinced it's the same sink, but how do we know it's the same Matt? Matt was never marked like the sink was.

[smartereveryday]

I really enjoyed the boats in the background. I also respect how difficult this was to make.

[achuth]

Getting a sink in sync on both hemisphere. A parker proof method.

[skyepyro]

Your ability to interact with "yourself" so fluently when recording your videos has always been impressive.

[UB]

From the director of _Watching Paint Dry_ and _Watching Grass Grow_ comes the greatest film of our generation: _Watching Sinks Drain_

[andrewkovnat]

It's a Parker sink! That's why you got inconsistent results.

[johnnymanhands]

Dear London, that's not the colour of water, love from Australia

[NickMick]

I'm waiting for the pictures to surface of Matt sitting on an airplane with a sink in the seat next to him.

[henry]

*Goes through airport security*

Border Control: "Anything to declare?"

Matt:"Everything including the kitchen sink."

[quedevilleantoine]

"Why didn't I think of that ?"
*Looks proudly at the camera*

[jomo]

11:55 - be honest Matt, you came up with the "Draining Montage" pun first, and worked backwards towards a video in which you could use it, right?

[BeingTheHunt]

When the airport staff saw the size of your suitcase they must have thought you brought everything but the kitchen sink... Well they were close.

[tombryan]

The amount of time, effort and preparation Matt must have put in is amazing. I wish I could give more than one like.

[Jako]

So this is where our Patreon money goes! 😂 Keep up the good work!

[Kwizii]

Wow the flow of conversation between the both of yous is astounding. Great job on the concept and execution of he video!!! :)

[Tytoalba]

“Hey, we should move the taps out of the way”
“Oh my goodness, why didn’t I think of that?” He says, knowing this would be a good bit

[squiddyfish]

If you look at the clock tower between 3:18 and 3:28 you see he goes back in time!! Let that sink in...

[dougware]

Matt, your videos never disappoint... "Oh my goodness, why didn't I think of that" - solid gold on two levels.

[Mijati]

How on earth do you manage to get a sink from England to Australia in one piece?

[andrewmole]

I have always thought that this experiment needed to be done, so I am very glad to see this!

Excellent timing and video editing to make the two Matts work so well together. Wonderful!