4 ms·
When Water Flows Uphill [video] (2013)
- theogravity 2y agoThe water ball maze at the end is really cool.
- bcraven 2y agoIt's technically a labyrinth rather than a maze as there's a single path.
- ARandomerDude 2y agoIt just needs a Minotaur.
- m_st 2y agoBarely related, but in Bern Gerechtigkeitsgasse they made an almost hidden art installation so that the Stadtbach (city stream) flows uphill in a small part. It's very fun to watch. https://de.wikipedia.org/wiki/Stadtbach_(Aare) https://de.wikipedia.org/wiki/Stadtbach_(Aare)
- mavhc 2y agoHow does it work?
- wumms 2y ago"The city stream is redirected in an underground, invisible loop so that it flows backward, or upstream, for a short distance. However, the backflow is always just outflow in reality. This is because the watercourse has a continuous gradient." (translated from a Google result excerpt of this paywalled article [0]) [0] https://www.derbund.ch/warum-der-stadtbach-aufwaerts-fliesst-146217667794 https://www.derbund.ch/warum-der-stadtbach-aufwaerts-fliesst...)
- tomthe 2y agoYes, that seems to be the explanation. I found a few pictures here: https://www.komoot.com/de-de/highlight/615007 https://www.komoot.com/de-de/highlight/615007 but they also do not show how it works.
- dools 2y agoI remember watching those little droplets form and bonce arond on the old solid stove tops we had when I was a kid, I loved it!
- tomw1808 2y agoI remember watching that video. About 10 years ago. Fascinating then, fascinating now.
- Karellen 2y ago"The difference between science and screwing around is writing it down" -- Adam Savage
- eleveriven 2y agoThe importance of documentation
- m-i-l 2y agoThroughout the video I was wondering what possible practical applications there could be. I got it at the end: "we use this effect to engage people who are otherwise not so interested in science".
- mistermann 2y agoI wonder if this could be used as the opening scene of a persuasive documentary on vaccines, it's pretty mesmerizing. Maybe an innocuous "How does it work?" theme with 10 phenomena, with one of them being vaccines.
- mdp2021 2y agoIt is still best to help the ignorant leading it to not being mesmerized.
- mistermann 2y agoWhen it comes to vaccines in a comprehensive scope, I suspect there is no Human that is not at least somewhat ignorant (or not all knowing), and delusional to at least some degree. The "science" aspect is but one part of a much more complex picture.
- mdp2021 2y agoSo let us have awareness campaigns, and make them unassailable by being perfectly honest - instead of furthering attempted manipulation ("mesmerizing people for persuasiveness through innocuous documentaries about the wonderful") as if it were aproblematic behaviour, and as if normal actually-adults would not be consequently exposed to dubious campaigns, with dubious results. I do not know about many places around the world, but in some areas it is normally told to children in primary school that "well, before these milestones you had an important risk of measles or poliomyelitis" - just as part of the history of science and achievements, primary school level. Which again suggests that treating people like adults - even very "underage" - remains an important recipe to obtain, in the end, Adults.
- HPsquared 2y agoHeat engines are cool. (These are an example of a heat engine: something that converts thermal energy into mechanical work)
- nojs 2y agoIf you like watching water flowing uphill, I highly recommend paying this spot in Taiwan a visit [1]. It’s a very clever and convincing optical illusion. 1. https://eng.taiwan.net.tw/m1.aspx?sNo=0002016&id=A12-00284 https://eng.taiwan.net.tw/m1.aspx?sNo=0002016&id=A12-00284
- wbrinkley 2y agoXenses Park near Cancun, Mexico, also has a great illusion with water appearing to flow uphill - it's very disorienting: https://youtu.be/c8v_CJtYjCI https://youtu.be/c8v_CJtYjCI (Water mentioned around 2:10) Nothing to do with the Leidenfrost effect, just interesting!
- calebm 2y agoWater flows uphill all the time - all you need is an Eddy (https://en.wikipedia.org/wiki/Eddy_(fluid_dynamics) https://en.wikipedia.org/wiki/Eddy_(fluid_dynamics))
- kurthr 2y agoI was just going to say, go to the beach. It's wind rather than steam providing the motion, but similar. Watch the waves roll up the sand slope!
- unnah 2y agoThe practical way to get water to flow uphill is of course the https://en.wikipedia.org/wiki/Siphon https://en.wikipedia.org/wiki/Siphon - always amazing in its own way.
- dredmorbius 2y agoWhich works in a vaccum as well. (Periodic Videos): <https://www.yewtu.be/watch?v=8F4i9M3y0ew https://www.yewtu.be/watch?v=8F4i9M3y0ew>
- TheRealPomax 2y agoIf you enjoy this bit of physics, and you're wondering if water flowing the "wrong direction" is something that happens in real life, aside from the other comments about wind-induced counterflow, definitely look up the Severn bore[1], too, which is a tidal bore that makes the river Severn flow inland twice a day, with wave fronts that can be large enough for folks to "surf upstream". [1] https://en.wikipedia.org/wiki/Severn_bore https://en.wikipedia.org/wiki/Severn_bore
- krunck 2y agoThe title should include that it is from 2013.
- alamortsubite 2y agoThe grooves at ~2:56 [1] are a result of the machining process? [1] https://youtu.be/zzKgnNGqxMw?si=0Qlrd-lcyAUvJHg8&t=176 https://youtu.be/zzKgnNGqxMw?si=0Qlrd-lcyAUvJHg8&t=176
- pge 2y agoThe Leidenfrost effect is also one explanation often given for why walking on hot coals without burning your feet is possible. The theory is that the sweat on your feet evaporates creating a vapor barrier that insulates the feet from heat.
- bragr 2y agoHuh, this a a solved problem. You can walk on coals because both the ashy coals and your skin are poor conductors of heat, your feet are only in contact with the coals briefly, and your blood flow carries the heat away from the contact points. The only trick is to walk gently yet quickly on them.
- Doxin 2y agoNot getting any coals caught between your toes is a big one too. Walking with cramped feet is a great way to pick up coals ;P
- deleted 2y ago[deleted]