Physics of toys-Big Cartesian divers-part 2 // Homemade Science with Bruce Yeany

[Music] La BR Shan and today in homemade science we're going to continue our look at cartisian divers now for just using droppers or straws as our divers then soda bottles are fine but I want to make something a little bit larger and for that we're going to need bigger containers so let's go take a look now here we have some containers that are going to let us make much larger divers now a couple them are specialized but I have some glass jars and plastic bottles and I'm going to show you how to adapt them so that you can try these yourself now bigger containers means there's all sorts of possibilities for divers we're going to try this soda bottle as a diver see how that works and I have this silver Christmas tree ornament it's Hollow glass and it's got a weight hanging down from the bottom there's all sort of plastic squeeze toys you can try I cut a small hole in the bottom of this one and I can add some weights to as ballast in this case I'm going to use a couple pennies here's a plastic bear jar that honey comes in put a couple holes in the bottom and some stones for ballast then I'll put the cap on this would work well and then also I have this plastic rat I glued a nut into the bottom of it and we'll try this and see how this one works so here's some of the divers that we could use let's go check out the bottles now it's easiest to start with some plastic bottles that have tight fitting caps that will give us an airtight seal we'll start with this one and into it I want to put this rubber frog so first I want to check him to make sure that he's just barely floating I'll adjust him here that looks good now let's put them in that container there we go squeeze the jar down he goes release it and back up I found that the big plastic jars don't seal very well with the Caps so we're going to take a few rubber bands and put it over the threads and I'm going to use a plastic bag to complete the seal so I'm simply going to cut this bag in half here we go and let's put our diver in it just barely floats now I'm simply going to put this bag over the top of [Music] it there we go then I'm going to take several more rubber bands and put over top of that just to create a good seal it's better to have too many than not enough otherwise it will [Music] leak now we're ready to give it a try push down on the bag that's going to increase the pressure inside and down the diver goes when I release it the pressure inside decreases and the diver comes back up [Music] again now once again we can try that same idea with this glass bottle I have a diver inside I have a few rubber bands on the glass bottle the bag and then several rubber bands over Top push down on the bag and Mickey dies release it and he comes back up again next we'll try that silver glass barall ornament as you can see it has a weight on the bottom of it once again when I push down on the plastic it Dives and I release it it goes back up this is my largest container it holds about 5 gallons of water and today I'm going to use this bottle is my diver I'll turn it upside down and that should be just about right now for the top of this I made a cap out of Styrofoam and when I apply pressure to this through this hose it exerts so much pressure it pops it off so I'm going to use tape to hold it [Music] down now I can blow through the hose and let's see what Happ happens it Dives and if I release it it doesn't come up so I have to uh decrease the pressure a little bit I'll suck in on it there it goes now I can control this with a bottle by simply attaching it to this side squeezing it down it goes and releasing it and it comes back up again now it's time to try the rubber rat this nut keeps him centered so that the bottom is down I'm going to adjust the water so it just barely floats put the top on squeeze the bottle and down he goes release the bottle and he should start coming up there he goes there's our rat diver now for a couple long naral plastic containers in this case it's very hard so I'm going to have to add a stopper to the top and a remote control let me put my diver in here now it's okay that it sank to the bottom because I'm going to be able to adjust the pressure inside and make them come back up again the stopper for the top has a long hose connected to it and at the other end there's a soda bottle if I squeeze it it's going to increase the pressure but I want to be a little bit more accurate so I'm going to replace the bottle with a syringe that's going to allow me to be a little bit more precise in increasing and decreasing the pressure attach our stopper nice and tight there we go now if I reduce the pressure inside hopefully it'll come up ah there it is hey came up pretty quick and increase of pressure and down it [Music] goes adding food coloring inside the test tube makes it easier to see not only what's happening to the bubble but also what's happening around the mouth of the test [Music] tube now I think one of my favorite containers to make cartisian diapers in is this 4T long plastic tube that's used to protect fluorescent lights uh it's actually flexible and it's open at both end so I'm going to need two number nine Stoppers the one stopper is solid and I'm going to put that at the bottom now just to make sure that it doesn't pop off when I'm squeezing this I'm going to use some duct tape just to hold it a little bit more securely [Music] now I'll go put some water in [Music] this our next step is to add the diver and the other stopper which I said has a hole in it goes on the top now to use this I have to put my finger over the hole and [Music] squeeze and the diver goes down and if I release it and he doesn't come back up again so to get him to come back up I'm going to take my finger off squeeze the container and then put my finger on top again that's going to decrease the pressure inside and hopefully there it comes the nice thing about using these longer tubes is it's starting to demonstrate that depth has an effect on pressure the deeper you go the more pressure you feel and it's actually due to the weight of the water well I hope you enjoyed this video and as always I want to thank you for watching okay bye