Love the dry engineering humor! "I got this tank at Home Depot on black Friday, which saved me money." Vastly understating the effort, and still being, what my ex-wife called, "A damn cheap engineer." Oh, and not cracking a smile. Because you know some non-engineer is going to ask a clerk at Home Depot where the high pressure tanks are...
I expected he gas to compress but for some reason I also thought the balloon would burst. I also was not expecting that around 50m we would enter the scrotal zone.
Amazing video. Now consider that the record for diving on a single breath of air (free diving) is 214 meters (704 feet). This balloon is a perfect example for that person's lungs.
In the opposite direction, that's why you don't hold your breath when you scuba dive. The air in your lungs is at the correct pressure for your depth, so if you hold your breath as you ascend, the air in your lungs decompresses and takes up more volume.
The styrofoam thing has been done, one was stuck onto a deep ocean camera apparatus and taken to the bottom, when it came back up it had shrivelled as all of the gases contained in its structure were squeezed out and could not have been replenished.
Interesting how the "deep" balloon resembles a helium-filled balloon being released for a high-altitude flight. In that case, extra envelope material is provided to allow for expansion as surrounding air pressure declines with increasing altitude. The two situations are analogous: the submerged balloon re-expands as water pressure decreases with ascent to the surface; the helium balloon expands as surrounding air pressure declines with increasing altitude. Question: At what depth does the balloon's compressed air exceed the density of water? (I.e., when the balloon is no longer buoyant.)
I noticed the same thing, the balloon in this experiment looked very much like filling the "Bubble" on zero pressure balloons. I've been on a couple campaigns for UDel/Bartol's AESOP and LEE payloads.
Why would it? Unless Im missing something, the air inside will always be less dense than the water around it right? Im probably missing something then.
Another awesome vid man. Just an idea, could you place a mirror at an angle so we can see the side and rear of items? Just more science to science with.
"Boyle's Ideal Gas Law" for anyone reading this & wanting to go further. Messinian Salinity Crisis is related btw, but is a massively neglected period of geologic history. It got REAL HOT down in those depths. Hope that'll get 'searched' by y'all. Also, 'adiabatic lapse rate' plays a role into this whole pressure aspect in respect to atmosphere Lastly this is the only RU-vid video I have ever watched that stated, indeed, liquids are compressible... otherwise fusion couldn't exist.
Even solids are compressible, but you have to push really-really hard. To detonate a baseball sized lump of uranium, which isn't quite critical mass, shaped charges are placed around the core. All charges are triggered at the same time. EXACTLY the same time! The same electrical pulse goes down each wire, and each wire is the same length. The baseball is crushed down to the size of a walnut. With the nuculi closer together, it now goes critical and gives off a fraction of a gram of energy. But, you can see how much effort is required. We live in a very specific, very constant environment. It tickles the brain to see other environments.
I have a friend who worked offshore oil rigs. As party favors he often gave away 16 oz.styrofoam drink cups that he (and probably his buds) had attached to their ROVs doing whatever the ROVs did. The formerly 16 oz. cups that he gave away were slightly bigger than shot glasses. He did say that some of the cups came up disfigured, but they saved the "good ones" to give away.
I was surprised the balloon kept upright the whole time. I was expecting it to fall at some point. Also, where in the world did the bubbles on the outside of the balloon at the end come from? Hmh. Interesting!
Yep. I'm going to be comparing a Yeti Rambler 18oz vs Hydro Flask 18oz in the episodes coming soon. I don't think the Stanley would be able to handle the pressures because of their lid mechanism.
What would be interesting would be to have a rudimentary force gauge (like a spring) on the base of the balloon knot. I'm curious if the buoyancy increases, decreases or remains constant as the volume shrinks with the depth.
I believe the buoyancy goes down as the space the air and the balloon takes up displaces less and less water the more it gets crushed, which is a terrifying thought that the deeper you go the more you start to drop like a stone to the bottom
If you guys are interested, I could do a follow up test later with the balloon free floating in the chamber. Theoretically, once the weight of the displaced volume of water by the collapse balloon is lower than the weight of the balloon rubber, we should see it start to sink if the balloon rubber has a specific gravity greater than 1.
@@TheDropzoneChannel it doesn't have a specific gravity of less than 1, this vid shows that since there is no sinking at all as the gas compresses under the water pressure. The compression most definitely reached the point where the gas buoyancy in water was less than the weight of the rubber.
@@DounutCereal Correct. The buoyancy goes down. A lot. Equal to the volume change in percent. So the first ten meters are the most noticeable. After that the percentile change drops rapidly until you only get minute changes in buoyancy the deeper you go. But yes, that is EXACTLY the problem why you as a diver ALWAYS have to check your depth gauge regularly, especially in areas with great depth but also great visibility. The change in light in those areas is virtually impossible to notice in the first 40 meters. However your sink rate goes faster and faster. When you notice your depth gauge to drop rapidly, check if your bouyancy compensator is still holding air. If not, your in a LOT of trouble. That's the time you have to think about shedding your ballast AND carefully, very, very carefully inflating your diving vest. Because once you've reached a certain point of depth the buoyancy in your vest won't be enough to keep you neutral if you are still carrying ballast/lead. Very dangerous indeed. But if you DO drop your ballast you also have to be extremely (!) careful about ascending again because you have nothing to keep you down once the vest starts to inflate again as soon as you begin to ascend and the pressure drops. The higher you go, the faster the percentile increase in volume, thus buoyancy, making it more and more difficult to keep under water. Which may result in hyperbaric pressure accidents, which are the absolute number one killer in diving accidents. The bends are mild compared to that; hyperbaric accidents kill more reliably.
i wonder if at max depth, if the balloon is popped will the air immediately dissolve into the water? and then on decompression would the balloon remain deflated with a simple puncture?
Was waiting for the balloon to pop at the end from the small amount of gas bening concentrated on a really small point, stretching the balloon in that small part
Regarding your comment about water barely compressing, if there were some material, solid or liquid that absolutely would not compress, does that mean it would be a perfect sound barrier?
It's interesting how all the dissolved air nucleated on the balloon as the pressure was released. Do you think this was because of the hydrophobicity of the rubber surface or the microscopic texture?
During deep dive traing we had to take a plastic coke bottom down to 80 feet to see the air compression then fill it with tank air and bring it up to see the expansion of air (or to show why you don't holdpyouur breath coming up)
Why did bubbles form on the outside of the balloon, as you depressurized the chamber? Was there still some air in the system, before you pressurized it? If you filled the balloon with a mixture of fuel and air, would the mixture reach its auto ignition pressure (don't try this at home)?
...they condensed from being dissolved in the water. That's how fish breath. If he boiled the water first before filling the chamber with it that would drive the dissolved gasses out and you wouldn't have the bubbles forming.
I was expecting the balloon to shrink.. but for some reason I also expect it to stop floating. I thought the rubber would contract and pull the top back towards the attachment point. Displacement obviously changes, so buoyancy must too... what's the explanation for that?
@@TheDropzoneChannel You build this with your own money AND can do a/v? Subbed and watched all videos. Probably the newest channel I've followed (beats 2 months). I prefer not to sub 100k+ channels, by that point any Sub, Like or Comment is just lost in a sea of mediocre. Will watch such videos though.
What happens if you put a: - fresh chicken - large cube of ice - soap bar - cork I think that nothing will happen to the ice cube (other than some melting). But, I am not a scientist, and I can only guess.
I have a project and I can' find an answer to it.......what will air expand to if you heat it in a sealed container from ambient 25 deg C to 100 deg C?
Is your pressure reading out of sync with your depth? During my diver training I was told that at the surface we are subject to 1 atmosphere or 1 bar. This increases by 1 for every 10m of depth, so at 10m I would have expected your bar reading to be 2.
Interesting question. My first thought was that since the gas is in a flexible container it can't really be liquified this way. I think. Butane would be a good gas to test as it liquifies easily. Compressing air causes it to heat up, however if constrained it will liquify as it cannot expand. Unless the water surrounding the air counts as the non-compressable container. I imagine it would need compressed more than this test rig can do. SCUBA air cylinders (the high pressure steel ones we used) are pressurised to up to 250 bar, the pressure equivalent of 2.5km deep in the ocean and the air is still gaseous, you could tip the cylinder upside down, open the valve and only air would come out.
Can't you also tell that the gas is still in the compressed balloon because the balloon stays upright rather than floating around from it's tether? My degree isn't in science, and it's been several decades since I've been in school, but it just seems to me that it's upright position, although compressed, demonstrates the presence of air still inside it. Is that correct?
Would you be able to take the air filled balloon to that depth and hook it to a line that has another balloon that has no air it in but it is at an equalized pressure and fill that balloon?
that is what happens to a humans lungs if you try diving without airtanks or go to deep. I wasn't expecting it to slowly squish. thank you for videoing my suggestion. it didn't burst?? :I dang it
it's amazing it doesn't sink.. I guess the balloon rubber is less dense than the water? Or maybe it would have to go even deeper to have the air soooo compressed that it simply doesn't occupy the volume needed to float?
What would happen if the balloon was filled with a gas that liquified under pressure (with the appropriate temperature needed for liquefaction). Im guessing the balloon would still look the about same-shrunken volume and all?
My only issue would mixing Imperial units [pounds per square inch] and IS units [litres].... why not use Pascals , which is one newton per square metre (N/m2), which is an SI unit?
Stupid! A pressure chamber is NOT pulling something, except legs. 🙄 The force pulling down versus the need to float pops the balloon. All my physics professors were weirdos too.
Thanks for the suggestion! That's not a bad idea just to get a comparison. I should've done that with this episode... I'll try and incorporate that in a future video, something filled with air and then with water.