The obvious answer is you just need to make an infinitely wide container. :)

@@TheMattThompson Ah yes, truly a response a physicist would love, along with those friction-less vacuums of course!

I might have my high school engineering students play around with this question!

There’s definitely an opportunity to go into detail about stratification and it’s effects as a fluid flows.

@@cact0s_ulion405 Consider a spherical cow...

he had to use the rest of the ink before HP bricks his printer for being mildly critical of the price

LOL@@ZaneEckols

The cartridge model between printer and shaver ain't so different. Sponsor's make a difference.

"one problem with the beads is that, they're really expensive." ... "i bought the expensive beads... i bought them."

@@contrapoetra Hope he recovered them from the water rather than just flushing the lot down the drain.

Probably quite a bit better than pure gold at current prices...

Not only the reference but printer ink is pure gold

An HP printer to be precise

Yeah, i have one and believe me. I wud rather buy a new printer than the ink@@Ahmed_Amine

HP ink is second in price only the Apple storage prices, and both are way more expensive than gold on per weight basis

If you have a video of this I would love to see this. The hexagonal pattern that forms has got me curious. It seems like this is the effect that is seen on the top of Saturn.

Is this phenomenon understood mathematically?

I want a lava lamp like that.

Flatland!

​@@STEAMerBear I love flatland. Wish I could live there 😪😪

is he our friend in a 2d world :0

Somebody introduce him to terraria

OMG HE'S FLAT STEVELY!! (Flat Stanley's cooler older brother)

This is in general the case, dimensionality has a huuuge effect on the dynamics of a system. A 2d vs 3d system can show completely different critical behaviour and phase transitions for instance, like the Kosterlitz-Thouless transition, if you do the calcumations in 3d it is a qualitatively different system. Same goes for 2d vs 3d magnetic systems

can someone explain the differences and maybe why they are so different. mentally it feels as if it shouldn't change that much.

To anyone studying 2D fluid dynamics: you are awesome and I like your strange brain

​@@conrrr The "easiest" to understand or at least visualise is vortex stretching. When a vortex spins, conservation of (rotational) momentum and friction are working against each other. In three dimensions, this leads to so-called vortex stretching, where the vortex stretches outside the "swirl-plane" along its rotation axis (vorticity vector). However, in 2D there is no third dimension for the vortex to stretch "into". But angular momentum and friction are still working against each other. This leads to completely different physics behaviour. Where 3D vortexes break up into smaller and smaller structures, while in 2D, the opposite happens.

@@mattias2576 Good point!

I've Navier heard such a good pun!

😅

That‘s what she said!

wow the whole world really cares! we needed to know that!!!!!!! lol get over yourself ego andy, this isnt your world.

For real though 😂 smooth is an understatement

I busted out laughing in my breakroom omg so funny

This is the comment I came here for.

100% came straight to the comments for this.

Similar joke in Goldmember where he tries to say pure gold is the most valuable substance and they start talking about caviar. :)

Paused at 5:00, purely to find these comments, and see who else is being exploited by Big Ink.

Rio Oompa Loompa.

BOOOO THERES THE DOOR

angry upvote

Happy Downvote.

middle midvote

Please do!!

It also tastes much better than Mica.

​@@VindolinI think I have to cast my vote for the mica soup actually.

i sometimes see it when i brew tea under a downlighter, in the caustics of the light hitting the bottom of the glass. Must be the heat haze.

Fighting in the dojo!

Miso is also significantly cheaper by weight than gold.

lol-ed

Yes, the sun is liquid, is no a gas.

@@BienestarMutuoBoth liquids and gasses are called fluids, and convection cells occur in both. In this instance the actual fluid that makes up stellar convection cells is a plasma. Pretty interesting stuff honestly, I got distracted and spent maybe 15 minutes reading about solar granules writing this comment.

@@joeyl6963 you have seen how the sun flares fall over?

@@BienestarMutuo The sun is a miasma of incandescent plasma. The sun's not simply made out of gas, no no no. I learned this from some people who might be giants.

That's so fast! So cool!

Damn that's cool. So do you just plop down a hundred miles away with nothing but your glider and your wits?? Lol or are the flights more controlled?

I'm kidding. I've been in ONE glider, when I got my aviation merit badge at summer camp. Only cool camps have airfields.

@supersonictumbleweed @@joshyoung1440 The best way to think of soaring is that its "the world's biggest game of hop-scotch": we'll find a thermal and climb - depending on the strength and height of the convection layer this can be anywhere from 500m - 3000m (1500 ft to 9000+ ft), then glide 10-30km (5-20 miles) while slowly descending. We then find the next bit of lift and repeat the process. When gliding we'll fly anywhere from 90 - 190kph (55 - 120mph). Figuring out where the lift is and how best to make multiple "hops" turns every flight into a bit of a mental puzzle; and since the weather is always changing no two flights are ever the same! We have all of the same controls as any small airplane (aileron, rudder, elevator), just no engine (hey, there's less to break, and no fuel to catch on fire)! 🙂 I know you were kidding, but sometimes we DO have to land without making it back home. We can land at airports or in farm-fields. The French call this going "aux Vaches" - translated to "with the cows". 😀Getting the sailplane out of the field and back home is its own adventure, but modern sailplanes have wings that come off after removing just two big metal pins/bolts. So we can disassemble them in about 30 minutes tow them in long narrow trailers behind our cars.

@@joshyoung1440 Damn I'm jealous, never been to a camp with an airfield.

I bought one and have been using it for about a year. In my opinion it shaves with a single blade every bit as good as my previous 4 blade razor cartridge. If you get the 100 blade box with your order (it comes with a 5 blade box if you just get the safety razor), you could shave every day, replace the blade every week, and not need to buy more blades for 2 years.

advertisement comment

@@BoliceOccifer "advertisement comment" And you evidence to back up that claim is what, exactly? I can not speak to the other comment before mine, but mine was made because I am in my 60s and started out with just this type of razor to shave with and eventually went to the cartridge type when the safety razor I had since I was a teenager wore out. My main purpose in getting the Henson safety razor was to save money in the long run and also it looked like it would last a lot longer than my first one. While replacing the blade is not as convenient as it was with my original safety razor, I have been very pleased with how well it works. So my comment was not for advertisement purposes but was made as a satisfied customer who wanted others to know how good this safety razor works. Perhaps you should not project your motivations onto others.

Thank you for your explanation. I was looking for them in the comments. You mentioned "this takes me back". Were you a fluid dynamicist?

@@lucas29476Maybe he's a fluid

@@lucas29476 In grad school, my research was in bilayer convection. With two layers, you can have either thermal coupling or mechanical coupling dominate the interaction between the layers. They tend to drive the flow in the driven layer in opposite directions, so when the effects are of comparable strength you can get oscillations and other interesting time-dependent behaviors near onset. I've since moved on professionally to software engineering, but I still love physics and pattern formation.

Aligning with shear flow sounds deceptively simple, it makes sense but it doesn’t quite explain why it feels relatively unique to mica. So maybe it’s not that unique? Steve kinda presented it like it was but I believe a lot of glittery shaped objects do that. Maybe it’s just the shape then and of course density to some degree I’d assume you’d want stuff closer to water’s density. Is that mostly the case?

@@monhi64 They're not unlike feathers or arrowheads in the rough shape. Flat and longer than they're wide. Unlike feathers though... They're heavy. They're hard to push around (while much easier to rotate). It's hard to relate to anything because we're used to moving around in air. But imagine maybe a diver's harpoon? A usually metal and heavy spear which has to be heavy underwater to work like wooden spears out of the water do.

Just as cool as air tunnels

I think you might find interesting the taylor couette flow experiment (not the high viscosity one, the turbulent flow one). Flow is usually displayed with mica as well.

Why not seems fun

ok roman thanks

Don’t tell me what to do

Watch this on shrooms. Got it thanks :)

Was thinking the exact same!

That's a hard experiment. They can't see through polycarbonate or borosilicate glass, he'd have to make the sides out of monocrystalline germanium or sapphire.

@@Lontracanadensis perhaps the experiment could be laid flat with an open top or something

@@jamie123b That might be interesting with the convection cells. I'd be curious what the centers or edges would show. Depth though wouldn't work, thermal imagers can't see through water either. I'm honestly not sure what if any liquids would work. Material properties in thermal imaging can be odd. Germanium, a silvery metal, is a clear lens, and I was shocked to find that cheap galvanized steel is a beautiful thermal wavelength mirror. (It was a Jurassic Park "why do we have more animals in there than we have in total?" moment.) Maybe air with some little flakes of something non-flammable and tiny enough to form a fog-like colloid?

Seems to me that there are materials that change colour at different temperatures, liquid or powder form should do it I would think. Wonder if it would cost as much per gramme as the beads?

Same here! There's a paper about composite coatings that seems to suggest shear alignment as a cause?

my guess is that because mica forms very flat very thin layers, the flakes would all have a similar geometry and therefor they tend to align in similar fashion in response to water flows around them

I think he meant to say "they align with the flow" in a way (because they are flat)

@@nicklanders5178 This was my thought, too. Flakes perpendicular to the direction of flow might be swept along, leaving the ones parallel to it behind slightly. Hard to say if that really works on such a small scale, though.

​@@SonOfFurzehattI would imagine the flakes align themselves to all be perpendicular to the flow, each one acting as a little sail

Huh another paraglider pilot beat me to the comments section with the exact remark I was going to make. I do hope our Reynolds number is closer to the oil scenario.

It would be interesting to have trigger points at the bottom to see if it works more like thermal triggers.

Paragliding pilot here as well. What I wouldn't give to be able to visualize thermals like this in the air! Seeing the flow along the ground toward the base of the thermal (for lack of a better word here), seeing how the single fast moving thermal was surrounded by a large area of slow moving sink (which makes sense), all very helpful. Thanks!

Yeah, thumbnails and titles are huge for this reason.

I think those are bubbles. Either from boiling or just the flow breaking off bubbles that were stuck to the bottom.

Yeah this was the part I found most interesting. It really does show the statistical/probabilistic nature of reality. Occasionally you will get these exceptionally high energy interactions, but on the average the overall energy level is reasonable. I'd often encounter this as someone who urinates standing up, when occasionally drops of water from the toilet would fly out and go past my head in height. You would think the kinetic energy would at most be able to rise up to it's original height, but the occasional splash in the face would remind you otherwise. (Like how a slow large ball colliding with a smaller one, sends the smaller one away at a much greater speed).

Omg yes I was waiting eagerly for him to talk about/explain it.. I hope he makes a video and talks about this phenomenon more in a future video because it sure seems VERY interesting. Such a great video nevertheless. Keep up the hard work Steve 💪🏻✌🏻

And I'm surprised how fast seagulls can ascend on rising air currents. Do they 'see' air currents, or fly around randomly until they find one?

@@technobabble_ That makes sense too! I can't really tell from these videos here, but I'm curious what it actually is.

I think I just got to the point with the al13 where I can complete a full shave without having to apply pressure to stop the bleedings. Single blade shaving is a very different experience. It's like moving from Python to C++.

Sigh. Lol

Must be part of the turbulent flow

@@akaHarvesteR how do you manage to bleed with a safety razor ? Do you have ancient parchment for skin ?

​@@Soken50my previous razor was a 1960s Gillette safety razor, probably the pinnacle of that style before the company went to the scam model I would cut myself with that razor almost every shave. I have not managed to cut myself on my Henson razor yet.

I agree. I also believe that evaporation of the alcohol, as he mentions, will also cool the surface quickly, causing it to cool and sink.

This is the review I needed to make the decision. Thank you.

It's also quite visible in a frying pan with some oil on the bottom. The "shimmering" surface of the oil is commonly referred to by culinary instructors as a way to know when the pan is hot enough to start cooking.

The shimmering effect is also increased when fish has been fried in it. Especially mackerel. But i think its has different cause.

You can get stable hexagonal cells with ordinary water in a pot. The water in the center of the cells will be a bit higher and the water in the lines between them will be a bit lower. Super easy to see. (But not easy to create!)

There is no unnecessary pedantry, only unappreciated.

@@Jablicek good one lol

It's really funny. Space Engine uses a voronoi texture for the surface of stars. And I always thought it was weird but never looked into it. And now after seeing the actual pattern on the surface of a star, I think it was the perfect decision.

You beat me to it (Schlieren _and_ motion amplification) Two of the most mindblowing things I've come across, in terms of understanding how something moves

What is the cheaper way?

@@suatmuradov8608 A grid pattern with decently thick lines would probably do something very similar

@@suatmuradov8608 In Martin Gardner's books black cells were printed as crosshatched IIRC.

The reason he can do it is because you’re watching this video. He’s reinvesting the money he makes from UKposts into making bigger and better educational videos. Ignore the fiscal aspects of the video and enjoy the science.

Looks like some people missed the subversion of the comment

And after prolonged use small fries crumbs made it more visible

i like to think of the flakes acting like miniature weathervanes

Hmm, would they align with the flow direction? What if rather than aligning with the flow velocity, they align based on changes in the flow velocity across space? Like, if the component of the fluid flow direction perpendicular to the surface of the flake, is greater on one side of the flake than on the other, it seems to me like that would cause it to rotate. (I would expect such rates of change over space of flow velocity, would be similar in nearby locations.) Idk, just an idea.

@@drdca8263I think your idea is better. I was just speculating why they would align.

@@hallohoegaathet7182 well, I wouldn’t have had the idea I had if I hadn’t seen your comment, I was really just trying to (potentially) refine the idea you already presented

My conjecture on why the mica poweder is rheoscopic is the powder is tiny reflective sheets, and they arnt really aligning. If they are in a shear force of fluid, they will roll, and they can only really roll in 2 meaningful ways. They can spin normal to their plane like a frisbee or perpendicular to normal of their plane, like a paddlewheel. Thus in a shear force, at least 50% of the mica powder is rolling like paddle wheels with their axis aligned with the shear force. They are all in a randomized state, but at least that axis is lined up and the lined up pieces act like a uniform mirror when viewed at the correct lighting and angle.

You can attach a hang glider to a trike with a small engine (like a rotax 447) on it and you won't have to search for thermals anymore. :)

@@LiftPizzas Flying mountain thermals in a hang glider is euphoric. No experience in life ever came close. Plus you build a knowledge of the air that powered pilots never achieve.

NPC flag alert

@@MattyEngland i am real lol

@@NxgtnLol, That's probably what an NPC pretending to be real would say 🤔🤣😉

I'm pretty sure modelling the special effects would involve some magnetohydrodynamics, possibly a large spinning sphere of molten sodium 😉

I very much agree-that’s also why I made the magma sculpture comment to another comment about Steve living in 2D.

@@Zi7ar21LOL! (What a great-and dangerous-idea 😉)

Perhaps you can use wax to represent the crust and oil to represent the magma.

@@Zi7ar21 Wow, I didn't even know magnetohydrodynamics existed!