Measuring pressure inside a balloon as it's inflated.

[@terraflubb]

I love it, "I am the evil archduke". I've read the Balloon Tree to my kids a thousand times, that's hilarious!

[@windsunh2o]

kzbin.info/www/bejne/lZzVkJ2HhaqMh6s Here's a reading of the book if anyone else is curious, like I was.

[@F3Ibane]

I absolutely love the fact that your life has led you to the point of being able to explore these uncommon ideas and share them with the world. Thanks for helping all of us satisfy our childlike wonderings and scientific curiosity simultaneously, Matthias.

[@bborkzilla]

Proof that adding carefully made graphs to any activity can turn it into scientific discovery. Even if it is just blowing up a bunch of balloons until they burst.

[@fuzzy1dk]

kzbin.info/www/bejne/eIS4fnV4e8-rqLs

[@spinafire]

Watching the pressure drop as the volume increases reminds me of elastic deformation charts for metals in mechanical engineering classes. Really cool to see in real time!

[@jenkinseric2]

Adam savage says the difference between science and fooling around it writing it down. Excellent science once again thank you

[@debramcknight]

This proves I will watch basically anything he posts…

[@SeanHodgins]

When can we expect the peer reviewed paper? I would be willing to confirm some results. 🎈

[@matthiasrandomstuff2221]

Yes, this is not up to the "gold standard" of studies! :)

[@mattcullen8269]

Holding 0.25 bar in 3 balloons was pretty impressive! I remember doing calculations for multi-wall pressure vessels (with the outer skin shrunk on), but I imagine it would be incalculable with rubbers..

[@T1nCh0]

@@matthiasrandomstuff2221 I prefer "wood standards"

[@emareaf]

@@matthiasrandomstuff2221 neither are most peer reviewed papers

[@ikocheratcr]

@@matthiasrandomstuff2221 Who knows, maybe you can win an IgNobel prize, or at least be nominated ;)

[@ScottWalshWoodworking]

This is what happens when Matthias goes to a birthday party

[@anicecoldbepis]

I want a refund on the clown. He didn't make balloon animals he just taught the kids about materials science and pneumatics

[@mushin111]

@@anicecoldbepis and refused to blow up the long balloons!

[@nelisvanderwalt4692]

Balloons are very interesting. For my undergrad final year project in engineering I did a study on a balloon problem. If you have two balloons connected together, one inflated only a little bit and the other one a lot more, the small balloon actually deflates and inflates the larger balloon. This is due to the material not behaving linearly like steel. In the study I had to predict the diameters of the two balloons after a valve between them were opened.

[@shobhitkeshri8282]

I would like to know more please

[@MiscMitz]

I love all the random stuff you do. Never thought I wanted to learn more about balloons. Thank you

[@sortodawy]

As a respiratory therapist, this video remind me the human lungs compliance graft on the mechanical ventilator 😀. Keep it up. You may come up with a solution to protect lungs from barotrauma.

[@thosewhowish2b693]

That's interesting. Couldn't a balloon in parallel with the tube act as a sort of fuse? It could rely on the innitial plastic deformation to limit the pressure, as when you have to blow harder the first time to get the balloon going. If the pressure ever gets too high, it starts inflating, and would thus also be shunting off pressure from the lungs.

[@CaribouEno]

Balloon busting for science! Now that's nicely done! That rising pressure before it pops can be felt when paying attention to get a feeling when you should not inflate more - in case you like really tight balloons but you do not want to pop them.

[@iznogudsurfer5911]

refreshing to see this childlike joy in the results of the experiments

[@byronaphasia]

Thank you for this. I am a speech language pathologist investigating the pressure required to inflate a balloon for respiratory muscle training. I often use balloons with my clients. There are many devices available to strengthen the respiratory muscles but the cost is an issue for many people. I needed some data to compare the pressures required to inflate a balloon compared to the pressures that are demanded from resistive and threshold devices. Balloons are a much cheaper gateway into this arena. I couldn't find any published data for balloons. Thank you!

[@TheTobias7733]

P = F/A In order to keep the pressure low, you have to increase the area. The area of a sphere is 4*Pi*r^2. For example: Double the initial diameter of the ballon will result in ~4x less pressure needed. Note: This is why smaller pressure pipes can hold higher pressure than big pipes.

[@andriyshapovalov8886]

I believe the formula is describing a closed system with the same amount of air, and therefore not related to the video. Smaller pipes as well as smaller balloon have steeper surface curvature, which is the reason for higher pressure to expand them.

[@anderswegge6828]

I remember that way, way back, your website got close to slashdotting over you making a digital camera out a flat bed scanner. I would love to see that revived here on this channel.

[@matthiasrandomstuff2221]

Don't have it any more. that scanner only had windows 3.1 drivers, so it became unusable a long time ago.

[@andrewschannel3635]

What do mean by “slashdotting” ?

[@fbcpck]

@@andrewschannel3635 it's when a site goes down from massive surge of traffic from a content aggregator (or any one source really) another version is reddit hug of death

[@anderswegge6828]

​@@andrewschannel3635 Wikipedia have a much better explanation than I could ever give: en.wikipedia.org/wiki/Slashdot_effect

[@dscrive]

interesting tid bit, lungs are very similar, if a lung deflates beyond a certain point it can take dangerous amounts of pressure to open it back up, but if there is always a little bit of pressure remaining the lungs will need less pressure to inflate. when that back pressure isn't maintained, each ventilation of excessive pressure causes damage to the internal bits of the lungs, which actually makes each "breath" less effective in terms of O2 CO2 exchange. I won't go into technical details (peep, pap, tidal volume, etc.) because, well frankly I only have a surface level understanding at this time :P

[@spugintrntl]

Is that what "collapsed lung" means?

[@dscrive]

​@@spugintrntl possibly, I believe that "collapsed lung" is a colloquial phrase for a number of medical conditions that affect the ability of a person to breath in and out properly. a pneumothorax and hemothorax are air or blood pressing on the lung from outside the lung but inside the chest, I think those are generally referred to as a collapsed lung. but there are other issues that require ventilation; congestive heart failure, Asthma, pneumonia, etc. the lungs have little alveoli, that are kind of like balloons too, that also need to pressure to work correctly (they are where the gas exchange happens)

[@rpavlik1]

Exactly the right amount of nerdy. Love it.

[@Malungeon18436571]

I think you should also be monitoring the temperature of the balloon.

[@mushin111]

Love the pressure volume (diameter in this case) loops, very similar to how we visualise data from cardiac catheterization using a pressure volume sensor.

[@120Livi]

This reminds me of first year university Civil Engineering 25 years ago learning about stress and strain and Roark's formulas. If only it was taught like this......

[@Lucas12v]

I'm always impressed by your range of skills and knowledge.

[@keithrpenny6484]

this has been very useful to me thanks for the work Matthias.

[@derwissenskiosk8041]

Thanks for that. I love these seemingly stupid, but simple scientific tests and studis... It grounds me to the importance of testing of fundamentals in simple systems. Often times these were the kind of tests where new discoverys have been made... :D

[@HWPcville]

As a youth, What we did when blowing up balloons was to suck on the tip creating a small bubble. That would create a weak point in the tip. Then when initially blowing it up the weak point inflated first when helped greatly. As an adult I haven't blown up many balloons lately. lol Thanks for posting.

[@yesschembri]

Answering questions nobody thought they needed answered

[@JKTCGMV13]

Thank you for showing the popping right at the start! Now on to the rest of the video

[@aliasks6559]

Even though I might not understand or follow all you say but the video very educational nevertheless, I love the inquisitive mind of yours - GOT to know stuff! My personal favourite was the video about How to measure the immeasurable - the device to measure how hardboiled the boiling egg is - great stuff!

[@NurchOK]

The last one looked really cool, as if the balloon just changed its colour...

[@cbalan777]

You're going to be finding balloon shrapnel for years. Nice video! Entertaining and informative.

[@NicoSmets]

That was insanely interesting.

[@holzwurm_hd7029]

I have seen a similar video from The action lab a few years ago. Very interesting how you two do things similarly, yet different.

[@alibronx2112]

such a great example of applying the scientific method!

[@jerryclarkson2191]

This is actually a pretty interesting materials experiment, it might be worth repeating sometime with more formal structure. Here's what I propose: * Standardize on the type of balloon you use. Different color balloons seem to have different material properties, so pick one size and color and stick with it. Clear balloons (completely uncolored) ones might be the most ideal, since they don't contain any coloring at all. 12" seems like a good size to work with. * Improve the diameter measuring process. Hang the balloons vertically so that they aren't pulled downwards by gravity, and maybe even come up with a scheme that accounts for the geometric distortion of the camera's field of view. You could use a laser level from a distance and measure the shadow of the balloon and do some trig to correct for the fact that the shadow of the balloon will be slightly larger than the true size The experiment I had in mind was to explore the hysteresis in a bit more depth. Do the standard burst pressure experiment with three identical balloons without any preconditioning just to make sure they're relatively consistent with each other. Then, repeat the first experiment you did here but with only a two-step process: first, inflate the balloon to a certain diameter, then let the air out. Then, inflate it all the way until failure. From this, we'll be able to see two things: the relationship between initial strain and initial inflation pressure, and also the relationship between initial strain and the maximum size and pressure the balloon reaches before bursting. I suspect the balloon will become larger if it has been preinflated to a larger size, but that its burst pressure may be lowered. Who knows though, perhaps the burst pressure will actually be higher, with the material having developed some initial tensile strength since the molecules will have been given time to work out their tangles during the preconditioning. You could further test this by varying the rate of inflation (very slow vs. very fast), which will affect the thermodynamic properties of the stretching process.

[@matthiasrandomstuff2221]

Go ahead and do it, send me a link to your video.

[@jerryclarkson2191]

@@matthiasrandomstuff2221 I'd love to but I don't have access to a place I could do it without disturbing the neighbors. If I ever do I'll be sure to link it though.

[@36736fps]

Unique experiment with interesting results. Thank you.

[@niske]

Watch out, this is getting the better channel Matthias

[@Google_Does_Evil_Now]

$3 sticker on the Microsoft keyboard. I liked this video and I subscribed. I came here from "The most effective distance to have a fan from a window for best airflow through a house" video.

[@FanPhys]

Great demonstration!

[@zweg1321]

Fantastic I always wondered This goes down in my book as one of my favorite videos of yours

[@Observ45er]

I am surprised that the second inflation does not show a similar pressure decrease in the mid range. I also really appreciate the way you try to get the pressure sensor well within the balloon. Others appear to have it in the hose where the flow speed can mess the measurement up. Although, even with yours, the flow is still passing by the sensor somewhat, but the reading doesn't seem to change when the flow stops - - so it looks ok..

[@Maker_of_Things]

Interesting experiment. As a kid I used to nest balloons before blowing them up, just with my mouth. For parties I'd nest the balloons, blow up the inside one as big as I could, knot it, blow up the next one, knot it, blow up the last one, knot it. You could then see there were balloons inside balloons, when you popped the outside balloon the next one would appear bigger and a different colour, and so on. The most fiddly one was stuffing four ordinary balloons side by side inside a giant 600mm balloon and then blowing up each of the four in turn before blowing up the big one around them. There was then one big balloon with four little ones bouncing about inside it! I think friends were less impressed by the balloons then they were by my ability to blow up the balloons by mouth when they were nested inside each other.

[@guillaumeemualliug8220]

3:40 that laugh where one can feel the second of doubt "am I really making science progressing?" The answer is yes. A thousand times yes.

[@roncooper6302]

The lovable mad professor. Best regards.

[@cashewABCD]

70cm/water ~1psi

[@briannelson605]

Nice experiment. It was surprising how tough the little long balloons were

[@justinmaynard890]

I love these experiments

[@bmedicky]

"You'll hurt yourself" is not a phrase one normally associates with kids' balloons!

[@larry78cj7]

I have no idea why this was so interesting?? Well done.

[@bombadeer8231]

Inflating large tires using ether might be interesting to you. It never gets old 💥

[@AeonMachine]

This is an excellent atmosphere of science and hilarity.

[@K.O240]

We did an experiment like this in med school. The alveoli in your lungs are similar to balloons. As you demonstrated, after the initial inflation, pressure drops as it inflates. If you were to hook up two inflated balloons to either side of a pvc pipe they wouldn't equalize. As one pushes gas into the other, the growing balloon continues to decrease in pressure and continues sucking more gas from the higher pressure, smaller balloon until the smaller one completely collapses. The same thing would happen to the alveoli in our lungs if not for the surfactant which decreases the surface tension, allowing the pressures to equalize, preventing part of the lung from collapsing.

[@samp-w7439]

"Matthias random stuff" really is the perfect name for this channel.

[@AlbertFilice]

Great video, reminds me of a balloon animal guy I saw as a kid, and he gave me one of the balloons (small and skinny) and I could not blow it up for the life of me. Later I noticed he would stretch the balloons quite a lot before blowing into them and would inflate the balloons very quickly with one or two breaths.

[@ikocheratcr]

What if you inflate the balloon, deflate it, leave it a few days, and re try the experiment to see if you get the "initial high pressure" effect?

[@Observ45er]

Another factor is that as the balloon inflates, you are basically adding a constant volume per time, however the surface area of the balloon expands as the as the square of teh diameter, but volume is the cube of the volume. So there is a Square-Cube Law effect, as well. Regards.

[@TUUK2006]

You stumbled upon something very interesting there. There's some debate about how much the pressure wave from the releasing air contributes to the noise of a balloon popping, versus purely the sound of the tears in the latex breaking the sound barrier. You just managed to get quite a sizeable noise with zero air being released. Interesting...

[@matthiasrandomstuff2221]

still a pressure wave. As one of the baloons pops, the pressure drops, which means the volume went up, causing a pressure wave.

[@Rickmakes]

Kids! Who wants to play "Pick up the balloon scraps!"?

[@LeightonGill]

Love the $3 keyboard

[@TheMovieCreator]

Tried to do something like this during choose-your-own-experiment for science class once. Totally pissed off the class having a lecture across the hallway, so I was unfortunately not able to get enough samples for anything decisive. I used the exhaust of a vacuum pump to get a steady flow into the balloon, so I could approxomate the volume based on duration. What I got a feeling for, based on the measurements I did take, is that pressure/stress in terms of volume seems to be a lot less overall if the balloon had been pre-inflated. In turn, I got the impression that the pre-inflated balloons also took notably more air before they burst.

[@nedmacallen]

The data we have all been waiting for

[@godzilla7382]

that is a perfect example of how elastic deformation and plastic deformation work. it is elastic deformation till it gets past a certain thresh hold which results in plastic deformation (the cause for it to be easier to blow up the second time.)

[@FlyingPancakes101]

Great video! Amazing shots and hilarious, love this.

[@kallamamran]

Now that was unexpectedly interesting :D

[@eduardkhaimov9927]

Love it, and so randomly placed

[@LFTRnow]

If you want this in freedom units (ie PSI) about 70 (cmH2O) on the screen is 1.0 PSI.

[@TheTarrMan]

What if you sprayed the balloons with "Armor All" before and inflating. Would that make the rubber softer and easier to inflate? Does "Armor All" (or any of those plastic/rubber treatments) actually do anything is what I'm asking.

[@Martin1519]

KZbin: hey, wanna see how much pressure some balloons can take? Me: Sure why not

[@DaveChurchill]

The pressure also probably changes with the rate of air flow into the balloon. You were inflating the fresh balloons fairly slowly, maybe try with more airflow and see if the pressure goes up?

[@essjayell]

I'm watching a guy measuring the inflation and popping of balloons and it's a minor highlight of my day. I'm not sure what that says about me.

[@vintyprod]

Wtf is this pressure unit

[@gearstil]

Very interesting study!

[@MCsCreations]

Pretty interesting indeed! Stay safe there with your family! 🖖😊

[@Andyjpro]

This lives up to the channel name

[@SuburbanDon]

Fascinating.

[@katelights]

thats a pretty good colour changing balloon trick

[@9A4GEMilan]

It is interesting to watch what happening at high pressure. I wonder how high altitude and cold environment can affect bursting pressure.

[@paulolsen4867]

Yes! Finally something I've accomplished before Matthias! Although.......... I just used my internal lung measure and inflation device and not not a transducer and graph.

[@giggletub]

Mathias, I wonder how you calculated or measured the surface tension and stress. Is there any chance you could post the spread sheet?

[@onesixfive]

i was wondering about this as well. some function of the pressure i guess?

[@giggletub]

@@onesixfive Being very oftem amazed at Mathias' ingenuity I assumed that that he worked out the math(s) himself. But googling "surface tension of a balloon" reveals that there is established science on the subject. The Laplace bubble law seems to be the key to understanding it. Plenty to read.

[@crixi__]

Very cool! Had a good laugh several times throughout the video :D Also, amazing graphs, very interesting!!

[@c0mputer]

Before blowing up balloons for balloon animals, clowns do a quick stretch on the balloons.

[@Observ45er]

Using a blood pressure gage I got this: Mouth pressure 0.0193 mm Hg > psi mm Hg psi Percent of 14 psi Lungs 90 1.74 12% Mouth 140 2.70 19% . Mouth is using the tongue as a piston, not the lungs.

[@Ottlaw67]

What brand of balloons did you use in the video I want to get some of those

[@CesareVesdani]

Air pressure drops when the balloon is inflated.

[@bobd.]

Very interesting. Why does the shape of the balloon affect the inflation pressure? Is it possible to calculate and plot the interior surface area of the balloon to the pressure as its inflated.

[@electronic7979]

👏👏👏

[@esepecesito]

I really like this kind of video of science of everyday :) very nice.

[@elibenyaacov]

newbie question, but if 1atm equal 1033cm, then how come the ballon inflates at a pressure lower than 1atm? isn't 1atm the normal pressure around us? thanks

[@lunam7249]

this is "excess" pressure, "overpressure" above normal air...normal is 14.72 PSI, This is aroung 1 PSI MORE = 15.72 PSI

[@elibenyaacov]

​@@lunam7249thanks

[@fredio54]

Awesome entertaining video, Matthias! Just what I needed to break up my work :-)

[@tom5256]

Matthias shows you things that you didn't know you needed to know.

[@elindred]

Parents might appreciate the Balloon Tree reference at the end.

[@BLenz-114]

Well that explains why I had no idea what he was talking about. No kids.

[@GoingtoHecq]

I think that I've seen clowns stretch the long thin balloons by hand often before inflating them.

[@bassnbluegill1406]

I forgot clowns are people for a second sjsjjsjsjsksutagw wn

[@thewoodtoybloke7446]

Ha Ha! You have successfully added to the world"s repository of useless information. Well done Matthias.

[@markmacherey4744]

interesting video, this is really good information that I didn't even think I needed to know... thanks for the video 🤔

[@MinePlush]

Are those tuftex

[@TLR_Eden]

Now i know more. Thank you

[@arkanglegeibriel]

Neat! Not a big fan of the BME280, still great job!

[@bradley3549]

Will the rubber recover/stiffen back up if left long enough? Or is the first stretch permanent? Gotta know!

[@josephgalla8562]

Hi There Hey this was a COOL Expierment Good Job and Thanks Joseph.

[@Wordsnwood]

That was a fun one.

[@andriuspetkuz7992]

i wonder, how much that keyboard cost ?