i” m sitting in a warm tub stuffed with solid sand this is among the coolest things ever before if you take a tub of sand similar to this and after that include air in simply the proper way it primarily ends up being a dissolved suit [Music] do in science this is called a fluidized bed it” s made use of in industrial applications such as powder layer paint or in grain silos to ensure that the grain flows efficiently to the outlet [Music] [Songs] with air on the top surface is virtually frictionless it” s like an air hockey table and also after that when you removed the air it ices up everything specifically where it” s at [Music] so today i ‘ m going to reveal you just how to make a simple variation similar to this yourself and after that because i came to be interested what it would really feel like to be totally involved in something like this we made a hot bathtub size version as you can see from the 60 years of age video from the royal institute of scientific research this demo isn” t precisely brand-new i ‘ ve intended to construct one for a long time but you can discover actually no information online on exactly how to make one like that so i began brushing with a bunch of patent drawings for huge industrial dimension liquid beds as well as i observed that rather of one big inlet they all had a lot of tiny openings to provide the air so beginning with that in mind it still took us 25 failed variations before we got here at this style as you can see it” s simply a number of fifty percent inch pvc pipelines set up type of in a ladder but the trick is to drill two one millimeter holes 90 degrees aside from each various other and also then do a bunch of those spaced 25 millimeters apart then you adhesive all the pipelines with each other and just ensure you orient the openings down so that will maintain the sand from getting in and after that you simply seal off the container with some hot adhesive as well as then load your container with either great sand or we located glass beads functioned really well and you could power with a small air compressor like this or you could simply rent out a big nitrogen container similar to this for concerning 30 dollars and also that” ll give you 10 mins of run time as common i” ll put a link to all of the components i utilized the construct in the video clip summary so my pal ken had an old busted health facility in his yard which we determined to put to great usage it just stops as well as you” re like locked in location it” s like a heavy covering on every surface area of your body [Music] um [Songs] since it was evaluated as well as ready in my ongoing quest to be the favorite uncle i made a decision to stun my nephews with it [Songs] however prior to we get to swimming in sand let” s talk regarding the scientific research behind a fluidized bed as well as we wear” t click away if you believe scientific research is burning out if you” re brand-new here you should understand that my technique to science is similar to velociraptor searching patterns i try to bring people in with a catchy thumbnail or a great point to see and afterwards when they the very least anticipate it [Music] clever woman undoubtedly the analogy breaks down a little at the end however if you assure to hang with me for the next two minutes i assure to attempt as well as stroll the fragile line between trying to make points easy to understand without oversimplifying or being contemptuous fluidization is simply when you have enough upward air so that the force of the air pressing on each grain of sand amounts to the descending force of gravity or weight and when that takes place on any kind of specific grain of sand it hovers in balance such as this you can consider pressures acting upon an object like a contest of strength if an item remains in balance that means there” s a tie as well as it doesn ‘ t speed up in either instructions just like in an actual tug of battle if the sides are also nonetheless if you include stone chilly steve austin to this side that will make it completely unbalanced and will begin to relocate by doing this which is in fact what happens if you accidentally turn the air up expensive as the fluidization happens in that wonderful place where the sand bits float at equilibrium which makes them very easy to move this is additionally the reason in some cases you” ll see pools pumped with air to cushion the touchdown for the divers now you observe that some things floats in the sand and various other stuff sinks this concerns the buoyancy pressure which is a feature of the density of the bordering liquid and also the volume of the object itself whenever an object exists in a pressure gradient there are forces from pressure pressing in on all sides however they push a little bit harder the deeper that you are which is why it harms more to be the bottom guy in a pet dog heap or it hurts your ears extra the deeper you dive in the pool and this makes feeling due to the fact that the deeper you dive the much more water there is over you pressing down as well as if you add up the size and also direction of all those arrows a number of stuff counteracts and you” re left with one internet pressure directing upwards that is the buoyancy force as well as if your bouncy force happens to be better than your pressure from gravity you float and if your buoyancy force occurs to be less than the force from gravity you sink currently we usually think of buoyancy with water yet you could think about things like helium balloons being buoyant in our environment so here” s a trick concern which of these has a higher buoyancy pressure it” s really the rubber sphere buoyancy force has absolutely nothing to do with the thickness of the object just the quantity so because the rubber ball uses up a lot more area it has a greater buoyancy force but you might object after that why does the rubber sphere sink and also the balloon drifts remember it” s a yank of war the rubber sphere sinks due to the fact that the force from gravity on the thick rubber skin and the air inside is larger than the buoyancy pressure yet for the balloon also though it doesn” t have as large of a buoyancy pressure compared to the sphere it still drifts up because that buoyancy pressure is bigger than the weight arrowhead from the helium as well as the thin rubber covering and the helium will certainly maintain rising like a sphere floating up from deep in a lake and after that it will eventually hang around where the density of the environment is approximately equal to the thickness of the helium of the balloon since that” s where the contest of strength comes to be equivalent we made it with now back to my [Music] nephews [Songs] my [Songs] as quickly [Music] oh [Music] alright say thanks to god [Music] oh [Music] you
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