Why Do Toilets Flush In Opposite Directions As Soon As One Crosses The Equator?
They don't. This is urban folklore, based on the fact that the Coriolis force causes large weather systems to rotate in opposite directions in the two hemispheres, if viewed from the same viewpoint--say, that of an astronaut in orbit. (The folklore was perhaps bolstered by an "X-files" episode in which Mulder noticed water in a sink rotating the "wrong" way.) Confusingly, from the point of view of the person or thing subject to Coriolis acceleration, the deflection is always to the right.
However, sinks and toilets are too small to be affected by the Coriolis force, which is a consequence of the curved surface of the Earth. That curvature is completely insensible on scales of a few inches or feet.
You can find more than you ever want to know on the topic in Wikipedia, includindg this limerick:
"On a merry-go-round in the night,
Coriolis was shaken with fright.
Despite how he walked,
'Twas like he was stalked
By some fiend always pushing him right."
– David Morin, Eric Zaslow, E'beth Haley, John Golden, and Nathan Salwen
They don't - its an urban myth. It is to do with the spin of the earth but the forces are so small that the direction of flow is not determined by which hemisphere you are in.
Copyright © 2018 HubPages Inc. and respective owners. Other product and company names shown may be trademarks of their respective owners. HubPages® is a registered Service Mark of HubPages, Inc. HubPages and Hubbers (authors) may earn revenue on this page based on affiliate relationships and advertisements with partners including Amazon, Google, and others.
|HubPages Device ID||This is used to identify particular browsers or devices when the access the service, and is used for security reasons.|
|Login||This is necessary to sign in to the HubPages Service.|
|HubPages Traffic Pixel||This is used to collect data on traffic to articles and other pages on our site. Unless you are signed in to a HubPages account, all personally identifiable information is anonymized.|
|Remarketing Pixels||We may use remarketing pixels from advertising networks such as Google AdWords, Bing Ads, and Facebook in order to advertise the HubPages Service to people that have visited our sites.|
|Conversion Tracking Pixels||We may use conversion tracking pixels from advertising networks such as Google AdWords, Bing Ads, and Facebook in order to identify when an advertisement has successfully resulted in the desired action, such as signing up for the HubPages Service or publishing an article on the HubPages Service.|