Which way does water swirl? (Coriolis Effect)

Which way does water swirl? (Coriolis Effect)

📫𝐎𝐮𝐫 𝐅𝐁 𝐏𝐚𝐠𝐞:

🎬𝐈𝐦𝐚𝐠𝐞𝐬, 𝐚𝐧𝐢𝐦𝐚𝐭𝐢𝐨𝐧𝐬 𝐚𝐧𝐝 𝐯𝐢𝐝𝐞𝐨𝐬 𝐜𝐫𝐞𝐝𝐢𝐭𝐬:
- Pixabay
- Pexel

📚𝐃𝐚𝐯𝐢𝐝'𝐬 𝐁𝐨𝐨𝐤𝐬
📕 𝗪𝗲𝗶𝗿𝗱 𝗠𝗮𝘁𝗵𝘀: 𝗔𝘁 𝘁𝗵𝗲 𝗘𝗱𝗴𝗲 𝗼𝗳 𝗜𝗻𝗳𝗶𝗻𝗶𝘁𝘆 𝗮𝗻𝗱 𝗕𝗲𝘆𝗼𝗻𝗱
📙 𝗪𝗲𝗶𝗿𝗱𝗲𝗿 𝗠𝗮𝘁𝗵𝘀: 𝗔𝘁 𝘁𝗵𝗲 𝗘𝗱𝗴𝗲 𝗼𝗳 𝘁𝗵𝗲 𝗣𝗼𝘀𝘀𝗶𝗯𝗹𝗲
📗 𝗪𝗲𝗶𝗿𝗱𝗲𝘀𝘁 𝗠𝗮𝘁𝗵𝘀: 𝗔𝘁 𝘁𝗵𝗲 𝗙𝗿𝗼𝗻𝘁𝗶𝗲𝗿𝘀 𝗼𝗳 𝗥𝗲𝗮𝘀𝗼𝗻
** The kindle versions are available

📄𝗧𝗿𝗮𝗻𝘀𝗰𝗿𝗶𝗽𝘁𝗶𝗼𝗻:
Does the water really spiral one way down the plughole of a bath in the Northern Hemisphere and the other way in the South? Folk wisdom has always suggested that it might be so. But has anyone bothered to check – scientifically, that is?

The question of which way the water whirls isn’t easy to settle. Complicating factors are at work. Is the bath precisely level and symmetric? And how much are the contents of the bath, and hence the vortex, disturbed when someone gets out of the bath?

According to theory the water should swirl in the opposite sense in the two hemispheres because of the Coriolis effect. This is best understood by thinking about an ice skater who’s doing a pirouette. The more she pulls in her arms, the faster she spins. A basic law of physics, the law of conservation of angular momentum, tries to keep the hands turning at the same speed when close to the body as when outstretched.

A similar thing happens when you travel north or south from the equator on the spinning Earth; nature strives to maintain your eastward speed as you leave the large circle of the equator (equivalent to outstretched arms) and move to smaller orbits (equivalent to pulling your arms in). Consequently, all things heading away from the equator get a small eastward nudge, while objects moving toward the equator are pulled westward.

Strange effects can ensue. For instance, if a cannonball were fired from the equator at a target exactly north of it, the ball would be moving at 1,000 mph (as would be the cannon and everything else on the equator) when it left the cannon's mouth. Its target to the north would be moving eastward more slowly, however, and so the ball would land to the east of its intended mark. The Coriolis effect complicates the navigation of high-speed planes and missiles and has a decisive influence on the circulation patterns of oceans and winds. But what about the water in a bath tub?

Just before it disappears over the edge of the drain, the water heading toward the equator is nudged to the west and the water approaching from the other side of the plughole, moving away from the equator, is pushed to the east. The result: a Coriolis tendency for the water in, say, Newcastle, England, to spiral counter-clockwise and in Newcastle, Australia, to spin the other way.

But it is a very, very small tendency. And, in practice, commonsense insists it must be completely masked by other factors, such as the random disturbances caused by getting out of the bath and pulling the plug, or the geometry of the bath. Casual observation confirms this and it is not unusual to see the water reverse its direction of rotation even during a single outflow.

The fact is, the water in an ordinary bathtub, sloshing about with all manner of currents, hasn't a chance of showing an effect that really only comes into its own over large differences of latitude. And yet, under strict laboratory conditions the Coriolis effect can be detected.

Experiments carried out, appropriately enough in Watertown, Massachusetts, in Cambridge, England, and in Sydney, Australia, all gave positive results. The Australian team concluded: "We have acquired confidence in the hypothesis that carefully performed experiments on liquid drainage from a tank will show clockwise rotation, if done in the Southern Hemisphere."

#water_swirl #coriolis_effect #direction

[scienceofuniverse]

Totally wrong.
First
North side clockwise
South side Andy clockwise
😢😢😢

[SaereeNon]

I belive that Coriolis can cause effect on large scales like hurricanes or whirlpools, but not on small scales like bathtub, that mostly depends on the design.

[bushraasharp]

watched this video at 0.25x. Still didn't get it.

[Ya_Khetilwe]

This fascinated me as a kid. When draining water from the bathtub i wondered why the water always swirled in the clockwise direction. Out of curiosity I'd force it to spin anticlockwise with my tiny hands, but it'd still spin in the clockwise direction within seconds.

I've always been curious, and 20 years later I've learnt the reason why. Thanks for this information. 👌🏾🤝🏽

[ThomasAtkins-rfwc]

So, now that the Earth is flat for some people, how then will the water swirl in the N hemisphere and S hemisphere?
Anybody?
And I am not a flattard.

[caylya]

This is just common sense. Nothing weird. The water thing is visible on large scales, not small scales. You fall on one side of the line because how it works to walk on the line. The egg balancing on the nail isn’t because of the equator, that’s a myth. It’s just someone took a really long time to balance the egg on the nail, like it usually does when you’re trying to balance an egg. How did you believe this? Unless you knew it was all a dupe and tried to trick the people watching this?

[Solestial_dusk]

Which was would it swirl at the equator?

[stijnwaegemans]

if the coriolis effect was visible on this scale, cars etc. woudn't be able to drive in a straight line without getting pulled off the road. It only counts for great distances.

[chakravarthit.]

In Your video icon the water roration image should be swapped ie., water rotates clock wise on northern hemisphere and rotates anti-clock wise in southern hemisphere, so the water images should be swapped

[mithunsivan]

North: Clockwise
South: Anti-Clockwise

[srivuttar]

i never been in southern in my intire life

[andreapicci]

Bullshits: those whirlpools are not due to coriolis effect, but simply on how is made the sink or the plate shower. They're too little to see coriolis effect: to see it, the whirlpool should be kms wide, and far from equator.

[franknada]

In the North the rotation of a water swirl goes COUNTER CLOCKWISE just like the hurricanes do.
In South rotation becomes CLOCKWISE.
Exactly on the Equator NO ROTATING swirl of water.

This is shown in Uganda At The Equator Water Experiment video

[mataharim]

My god. The speed of narration is unbearably slow.

[rattlin]

Me and my boys declare Nonsense on this! We get a decent whirlpool after every bath, and when we purposefully spin it the wrong way it corrects itself quite quickly 💪

[RobertTozzi]

Well, if this were an actual occurrence, a helicopter could hover near the equator and travel 1000 miles per hour... but somehow the air travels with the earth at this speed too, so this doesn't occur, you'd say? Well then if Coriolis effects water and storms but not air, isn't gravity super selective?