In this video Michael Aranda explains what the Leidenfrost Effect is, and how it can cause liquid to 'levitate'.
Hosted by: Michael Aranda
Like SciShow? Want to help support us, and also get things to put on your walls, cover your torso and hold your liquids? Check out our awesome products over at DFTBA Records: http://dftba.com/scishow
Or help support us by subscribing to our page on Subbable: https://subbable.com/scishow
Looking for SciShow elsewhere on the internet?
I’ve watched this video several times over and I think this could solve the liquid transfer systems onboard the ISS. We just need hoses that are have these grooves cut into them.
That hot water almost looks how it would in microgravity.
When I was a kid my best friend had a really old wood stove in his living room, one of the older types that didn't have a separate fire-box & outer cover to keep you from touching the glowing hot iron & on cold winter days we would have "spit races". We would spit on the stove top & then just blow on it and they would shoot across the surface as if floating in mid air.
that happened when the Mississippi river ran backwards due to an earthquake (or so I hear...)
But what interests me is when a bead of water forms not on a hot surface, but on the surface of another body of water. This often has a very short lifespan so most don't notice them, but mildly soapy water seems to extend their lifespan to an extent that they can be noticed more readily. And no these aren't hollow soap bubbles but full water beads, no air. They don't cruse along the surface like a bubble or cling, they bounce almost like the things in this video do.
@scishow does it have to be water. is it something to do with the surface tension of water being able to hold a droplet. or could you use a liquid with a lower boiling point requiring less heat to get the same effect? thank you
I found this after preheating an oven, forgetting that my mom likes to store a large metal bowl in it. Found the bowl still in there when the oven was done preheating. Decided to put the bowl in the sink to cool off. The tap happened to be dripping. A drop of water happened to land in the bowl, and I watched in amazement as the drop raced around the bowl as though the bowl's surface was frictionless.
+Rizu Chan Okay first take a science class. You can learn all about this In a 6th grade science class. Second, the cloud droplets are only several millimeters if not centimeters that are attached to dust particles in the sky. They are literally very light. A cloud is not one giant entity but a collection of cloud droplets. Clouds only way several tons because you are consolidating all droplets into one entity. Once they are heavy enough and large enough it rains. Gee, Go to a weather class.
+Baran Hekimoglu sorry for the past comment. It's just that I'm tired of racist comments. We're not even Arabs in the grand Maghreb (or at least what I think. And it makes sense because those in the middle east don't understand our dialect) but I still don't like it. On Facebook, Google, every thread they have to pull some sick jokes. And it's hurtful after all. Have a nice day!
so if you spin the pan the water all flows in a circle in the same direction collectively, so if we scaled this up and heat mechanism passed that point, we could have thousands of gallons of water forming a cyclone that will dissipate slowly, we have some kind of turbine the water is spinning and we gain electricity from it, but we don't waste energy heating up the large pot by placing it by a volcano, or drilling into the earth till we find a pocket of magma, or we scale this up and put it in space by our sun and use a liquid that wont go away over time, or find a way to decrease the temperature required, idk it takes thinking but it sounds possible to have clean energy from this effect.
step 1: Room temp gas cooled to liquid and stored in pressurized tank in backback
step 2: tubes routed through hand controlled valve to front bottoms of shoes with backward facing grooves.
step 3: profit!
Maybe there is a way to apply this to create hover boards. Something which I have personally been long awaiting (And hoping the laws involved will be the same as riding a bike). I have no ideas on how this could be applied to hover boards but maybe it is possible.
Couldn't you get a gas that had a density of at least 1.1g/1ml squared and then put the gas in a cup of water? That way the higher density of the gas would make the gas sink to the bottom of the cup, lifting the water.
I remember seeing this! When I was in my high school chemistry course, my teacher accidentally spilled liquid nitrogen on the floor. I thought it would just splatter, but instead, it popped into a bunch of liquid balls and rolled across the floor for a long distance! I was stunned, but no one else noticed or cared. My teacher didn't notice or have an explanation.
Now I know what happened!
This effect also allows a person to dance liquid nitrogen on their tongue. Make no mistake though, going in and out, it must not touch your teeth... otherwise it'll contract the enamel enough to crack it. Also, someone mistook this as reason to *drink* liquid nitrogen. That produces... catastrophic results...
That's so cool. I recently observed this effect myself when I spilled a small amount of liquid nitrogen on my lab bench. Nitrogen is a gas at room temperature, so upon touching the bench, the droplets of liquid were coming in contact with a surface at much higher than its boiling point and started zipping around.
Could you explain how, sometimes when I pee, droplets above the surface appear to skitter away from the point of pee entry to the edge of the bowl, seemingly without friction. I'm interested in this, but not interested enough to set up slo-mo cameras at water level and all.
There is also a really interesting phenomena if you let the droplet form inside of a slight concave bowl (like the one on your stove). The droplet will be forced by gravity to go to the lowest point, and if it is stable enough, and if the stove is clean, the droplet will start to spin around it's own axis. And it will spin really fast. Above some speeds the droplet even starts to oscillate through certain patterns, and there is a really cool star-shaped pattern that appears if you are patient enough. It can be seen from the side that the droplet is spinning amazingly fast.
Also, if the droplet is big enough a bubble will sporadically form in the center, not quite bursting through the surface-tension, but big enough to lift the drop and increase the rate it is spinning at. When the bubble collapses it will cause the bubble to all kinds of things, ejecting droplets, bounce up and down, reverse the direction of spin, or form the star-shaped I mentioned. Really interesting physics, try it out the next time you're cooking!
I've observed a similar effect at room temperature, (though I expect it has more to do with rotation and surface tension.) Splashed sea-water will sometimes skate over the surface for a few centimeters, before coalescing. Never tracked down the name for this effect. (I call it the rouge hydro-dynamic effect, for want of a better name.)
The class of drugs that Levitra, Viagra, Stendra, and Cialis belong to are called PDE5 inhibitors. They work by relaxing tight blood vessels, allowing more blood to surge into the penis and cause an erection, says Gregory Bales, M.D., an associate professor of urology at the University of Chicago.
The little pills do the trick for more than two-thirds of men with Viagra protects the heart (ED). They also work for guys who simply need them for a short time to get their “confidence back,” says Michael Eisenberg, M.D., director of male reproductive medicine and surgery at Stanford University.