Steve Mould - 2020-10-08
Win your Ultimate Tech Bundle by entering Fasthosts’ Techie Test here: https://www.fasthosts.co.uk/stevemould (Competition is now closed) I'm reluctant to say "gravity defying", but come on, this is cool! You can levitate a viscous liquid just by shaking it! Not only that but a buoyancy effect appears on the other side. I also show Kapitza's pendulum. Here's the playlist of videos that feature the stroboscopic effect: https://www.youtube.com/playlist?list=PLcqX4UMXNKEc8KQxfq5hM25ad9IBQ5S4m Here's the original upside down pendulum video: https://youtu.be/gnn21smGVrQ David Acheson's books are here: http://academic.jesus.ox.ac.uk/dacheson/ The Kapitza pendulum paper is here: http://butikov.faculty.ifmo.ru/InvPendulumPTSE.pdf Here's the research that lead to all the nice levitation footage from Benjamin Apffel, Filip Novkoski, Antonin Eddi and Emmanuel Fort: https://arxiv.org/abs/2003.04777 You can buy my books here: https://stevemould.com/books You can support me on Patreon here: https://www.patreon.com/stevemould Just like these amazing people: Joseph Galliera Nathan Williams Matthew Cocke Glenn Watson Mark Brouwer Joseph Rocca Joël van der Loo Doug Peterson Yuh Saito Rashid Al M Paul Warelis Will Ackerly Twitter: http://twitter.com/moulds Instagram: https://www.instagram.com/stevemouldscience/ Facebook: https://www.facebook.com/stevemouldscience/ Buy nerdy maths things: http://mathsgear.co.uk
Finally. I've always wanted to levitate some silicone oil but was never quite sure how to achieve it.
@MustyBaguette Ha, ha, the key is good timing.
😂
It's not levitating, it's balancing.
@B G "half of the bottle" of silicone
Finally (,) I've ......
Ohhh, so that's why Australian boats don't fall off the Earth.
Vibrates at 50hz
Grade A comment.
Everyone claps!
No, it's because Newton's theory of gravy also works with honey or silicon oil
@Robert Kesselring as long as they hop in sync.
Oh wait, if they are in sync, the continent might break off of the earth.
Literally made me laugh out loud! Bless XD
"Inverted buoyancy" is definitely a high school project winner. Looks so simple, yet so unreal.
and tomorrow negative energy for the school science project warp drive engine
The "Inverted Buoyancy" part of this should probably be mentioned in the title. I would watch a whole video only about that!
I wanted the scientists to deliberately "sink" the upside down boat (with a stick or something) - to find out if it would automatically flip when it got to the real surface
Sadly I think he could do a better job at explaining it. It is actually a stable equilibrium. Buoyancy isn't really applicable here. You have to dig further. Where does buoyancy come from? It comes from the different levels of pressure at different depths. Most of the time this pressure difference is caused through gravity: when there's a greater amount of water above it this will create more pressure.
Next: how does pressure work? Pressure applies uniformly in all directions.
So the buoyancy is created through a larger pressure underneath the object than above, so if you subtract the force pushing downwards from the force pushing upwards you will still get a resulting upwards force: buoyancy!
But now the question is, how is the pressure in the liquid. I would presume that it's the lowest on the top and the bottom, and the maximum is somewhere in between in the lower half. So if you have something in the lower half it will experience a buoyancy downwards because the pressure over it is greater than under it. But then it starts to get interesting if you look at the air underneath it. This air also has a higher pressure...
I love the little boat the put in there. I'm just imagining an excerpt from their paper on this effect. "Compared to a liquid at rest, the analogue navel vessel (ANV) displaces..."
"Here is my vibration generator"
Okay, Steve.
Steve’s wife: Give that back!
@Mark M holup
Wow, I've seen lots of mind-bending science youtube videos but a boat floating upside down on the bottom of a levitating lake of silicone oil might take the cake. Great video!
This upside down buoyancy is the most incredibly interesting thing I have seen in a long time!
This was a really good video, this is a marvelous effect I never knew existed and it goes completely against my intuition. The video explained everything very well and in a simplistic manner, and I found it genuinely entertaining to watch. Thank you!
8:40 You originally said "body of water", didn't you. I almost didn't notice the overdub, that was really well done.
@Steve Mould வணக்கம்
@Georg Plaz same i was sure the audio was messed up and i checked other things to check my internet
I looked at my screen at exactly that moment and thought the sound was out of sync and was going to reload YouTube.
Nice catch. Foul ball
Woah. Overdub? Is that for anti noise purposes? Realizing that the voice and the footage are not the same somehow ruins my experience...
He obviously wasn't vibrating fast enough.
I LOVE this video. A few weeks ago I read the article that you referenced at the beginning, and I couldn't quite wrap my head around it. Your explanation and the scientists' video footage really make this whole concept much clearer. Thanks Steve!!!
Awesome explanation, 3rd year physics undergrad here and always love watching your videos.
Don’t suppose you’d do one on complex networks? (My dissertations on it haha)
“If you want to find the secrets of the universe, think in terms of energy, frequency and vibration.” Nikola Tesla
anytime you want to "defy" physics try vibrating it really hard, it might just work
String theory. Yea.
@Chasen Wayne There is no need to vibrate them individually, you can just vibrate all of them. Which you can do, with a heat gun (it's like a powerful hair dryer), microwaves, fire, or an electric heating element. Though if you could focus it to just a small(ish) number of atoms, the effect would be localized, but stronger. Which you can do, with lasers. That's how powerful laser pointers can light matches and pop balloons, and industrial lasers can cut metal.
It's a miracle how I havent got the nobel prize after all these nights of vibration. I guess I'm not vibrating hard enough
I am fixing my car light and TV this way
This works very well for video games, especially with spinning.
4:20
I want this as an XXL version so that I could dive in it until I dived through the first one and jump into the second one 😊
It reminded me of a part in the movie "A world beyond", when they swam in a levitating water bubble.
10:28
How would it feel to just hold out the head (like the upside down boat) and still don't falling down. 😅
Awesome! thinking of applications I know - I'll hide my valuables in an opaque honey jar underneath a floating layer of honey! No one will think to look under the violently shaking honey jar! Now I just need to devise a bottom hatch that can open and close while the jar is shaking so that I can store and retrieve things without them getting sticky...
Dude, great work in the edit, that voice over of 'Liquid' when you say 'water' is seamless! Even got the tamber on point. Well done!
I saw that levitating liquid and inverted bouyancy video but wasn't able to wrap my head around it,you made it pretty clear. Though I do not understand the whole process but the explanation you provided made intuitive sense. Great work.👍
Thanks for this great video. I like your intuitive approach to explain the stability of the vibrating inverted pendulum.
You can even explain the stability of the vibrating inverted pendulum without mentioning forces and vectors (which is already quite advanced for children in elementary school)
When pulling the rod, it acts as a hanging pendulum. When pushing the rod, it behaves like an inverted pendulum. The time it takes from a perturbed pendulum to move towards it's equilibrium point is much shorter than the time it takes for an inverted pendulum to move from it's equilibrium position towards a small displaced position.
It's not as accurate, since it's a little more complicated than that, but it's even more intuitive.
"It makes no sense until you think about it for a bit. And then it makes sense again. And then you think about it a bit more, then it stops making sense. And then you think about it even more, and then it makes sense again"
This applies to a lot of things in life and life in general lol
@Felipe Lavratti yep
So everything is women
Me with quantum mechanics..
Me when I see this comment, and think about it...
And it explains why, when I was a kid, I intermittently believed and disbelieved that I could lift myself up by my bootstraps. But since I had no boots I could not test the "theory."
Your explanations are incredible. Thank you!
I wanna say thank you man and please keep making these videos. I just now found this channel and i LOVE the fact that i get to listen and learn SO DAMN MUCH. Like..... yes. The world needs this lol
Amazing! This reminds me of something else...
This stabilising effect of a vibration to a vertical structure can also be illustrated in five storey pagodas common in Japan. The topmost spire or sorin consists of a shaft on which floating rings are attached near its base which springs from the roof. This shaft runs along the entire core of the tower and is free floating. On an event of an earthquake, the rings jiggle vigorously, stabilizing the shaft. This , together with the manner of construction of the tower, ie wood joinery, are believed to contribute to the overall seismic resilience of the structure. These pagodas are vaunted to have survived severe earthquakes.
Very cool video! Also interesting is seeing the liquid drip from that upside down boat, sort of escaping the tension through that pointy bit on the top!
Steve. You make, hands down, the best educational science videos on the internet.
Can you do a video on exoelectrogenic bacteria? I feel like you would explain it so well. Thanks for the great content!!!
This video was great! I loved it. Your explanation made sense for explaining how the liquid flattens out, but it doesn't explain why it doesn't still fall (while staying flat). Would you go into more detail on your explanation of this really neat phenomenon? Also, would it work without the walls? Or, would it work 3 dimensionally (vibration up and down, left and right, forward and back ward, all orthogonally to one another) to create a cube or sphere in the middle??
Steve, I love your videos and I think you do a great job giving us good conceptual understanding of the topics you discuss. But it can be hard to find the time to watch these 10+ minute videos, and I often suffer from a bit of FOMO when I have to put off watching some of your new videos because of the length. As I suspect that I'm probably not the only one with this (admittedly first-world) problem, would you consider upping the (# short video):(# long video) ratio in the future?
1:40 - "A group of scientists were working on the problem..." It amazes me that someone was sitting around and one day thought, "The fact that honey doesn't levitate in the middle of a jar is a real problem that needs solving."
@asailijhijr that does not mean its useless ... we humans always find somethings out of curiosity which seems useless and a waste of resources at first but actually turns out be beneficial afterwards
@David Wührer they blow oxidiser directly into combustion chamber, not into fuel tanks.
@xponen_ they usually use ullage motors to utilise the laws of momentum to move the liquid where they want, however now they are starting to use "balloons" filled with helium to push down on the liquid fuel/oxidiser to keep them in the right place. think pushing a smaller can into a slightly larger one to push the liquid inside all the way to the bottom. thats a real laymans way of putting it but it has very similar principles
Taking up that point, response of liquids to periodic motion has been significant in far older technologies than space vehicles - stability of ships with part-full tanks or partly swamped, response of storage tanks to earthquakes, and sloshing of water in locomotive tanks and tenders (which has caused derailments), for just a few examples.
That is how scientist do have fun
Amazing scientific communication here.
Putting the components on the flat table to remove gravity from the picture was brilliant
Hey Steve, I watched almost all of your videos, I had a blast you are so interesting and funny.
Wow! That standing pendulum explanation was really impressive!
Very good presentation. Some vloggers think you need background music (in the foreground) or elevated playback speed to demonstrate the laws of physics. These videos of yours are a delight. Thank you!
Loved your pendulum explanation with the torque and perpendicular forces, actually quite intuitive!
Jeez, that is amazing stuff. I appreciate it very much, just curious, what’s the real life application? Or maybe in a sci-fi setting, could there be a large scale application of this effect? Boggles the mind
That was amazing! My thought now is whether or not this principle can be applied to other types of levitation, like a hoverboard.
you make some of the most unique science videos. love it.
Scientist: Are you stable?
Viscous liquid: Well yes, but actually no
Me and a viscous fluid have something in common then!
I got to be the 420th like, too bad it wasnt at 4:20. Still an honor.
@Chasen Wayne Congratulations, I'm seeing your 420th like now
same
Engineer: Any sufficiently advanced technology is indistinguishable from magic
Fab; Loving your vids increasingly. Thanks a lot
Question: Are those boats being attracted to one another? Due to dynamic forces in the fluid? Or is the lateral motion a coincidence?
This explains a lot of things for me! Thank you!♥️👍🌟
This is insane...since I was a kid, I always thought it would be cool to have a liquid sheet suspended by forcefields to dive through into a pool at the bottom.
This is incredible! One of the many things I love about your videos is that I know I will always learn something new, and in an inuitive way.
Keep up the good work.
Not the inverted buoyancy thing... that’s plain witchcraft !
9:50 but in the end, the making sense of the problem averages out until there is a stable making of sense.
Shaking the head in a stable frequency helps
@Anton Synchronized nodding of heads
Interesting to see the results of such an experiment in zero G or in microgravity in the ISS. Would everything just be in equilibrium even with the vibrations? 😃
I think it's awesome when scientists do things like make their buoyancy test items look like tiny boats. Makes you think they're enjoying their work 👍
Fantastic video, and credible explanations.
Do you have an explanation and experiment about how airplanes fly? I am surprised it´s an issue without consensus in a theory.
The levitating liquid is a very good approximation at the complexities of the stable dynamics of an airfoil.
Great video and something I've never seen before. Truly amazing content.
"Dear, why is honey and 120 Hz Vibration generator on the shopping list?"
"mind your business, Dear, that's why!"
"I've got plans, and there's science to be had!"
"I thought you said your sister was coming to stay this weekend?"
@Pronto science night
Sir your videos inspire us to learn more about the world around us and question the curious phenomenon around us
for those of us whose parents didn't went to university you inspired us to take action by these different content thank you
I am a younger physics teacher. Your videos capture curiosity at its finest, and I have learned a ton from you that I intend to share with my students. Thanks for the great content and excellent explanations! I especially appreciate how you tie in real-world applications (thermocouple/water heater, entropy/Sterling engine, etc.) I also decided to have my students build tensegrity structures while they study vectors!
Steve Mould - 2020-10-08
A big thank you to Benjamin Apffel, Filip Novkoski, Antonin Eddi and Emmanuel Fort for giving me their experimental footage. Hope you all enjoyed the video!
Tanner W - 2021-12-19
Would there be terminal velocity in a vacuum chamber or would you continue to fall down faster and faster?
Nathan Brickles - 2022-02-20
I would think we've known about this a lot longer than 50 years...I would say since the invention of the glass bottle...you can't tell a little kid never got curious and tried to make a water tornado and then turned it on its side to see if they could cause the same effect...it the same way with scooping up a cup full of dry dirt out of the driveway and shake it...you would think the rocks would end up at the bottom but they actually float to the top and the dust will be at the bottom....again I would think this would be something known since the invention of the bucket especially when a child at just the right age sees it as a toy and treats it as such
Joel Auger - 2022-04-15
nice video as always. your pendulum explanation seem strikingly similar to descriptions of how the em drive could work🤔 thought it was interesting thats all.
Luke Arts - 2022-04-17
Oh No! You guys just gave the flat earthers yet another physics phenomenon to misunderstand and misinterpret... X"D I really appreciate how you break down problems that are usually tackles with pure math into intuitive visualizations. Because for most applications, understanding the concept is enough without knowing the actual math.
Joel Auger - 2022-04-17
@Luke Arts 98% off the earth's water is not carbonated so...... technically the earth is flat