"Bouncy" sulfur hexafluoride gas in tennis balls?
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- Опубликовано: 28 авг 2024
- Testing myths about gas inside tennis balls.
Note: I should have added that all of the gases tested would have the same bounce height in a perfect no-loss system. The reason that SF6 bounces higher is because it heats less during compression, lowering the amount of possible thermal loss. Argon heats more during compression, and can lose more energy because of thermal transfer from the gas into the cylinder walls, where it is not restored upon decompression. Things are more complex in a tennis ball, though: Most of the losses are in the rubber shell, and not in the thermal dissipation of the fill gas. It's hard to estimate, but I'd say that the highest fill pressure, with a high-gamma gas would prove to be the most bouncy since it would cause the rubber shell to deform the least. The amount of compression in a tennis ball is very low, and any effect due to the gamma of the gas will be extremely small. Fill pressure will have a dramatically bigger effect.
Google drive link : drive.google.c...
Nike Air: news.nike.com/...
EPA SF6 use: www.epa.gov/si...
100 kg load cell: www.amazon.com...
Instrumentation amplifier: www.ebay.com/i...
SF6 on eBay: www.ebay.com/i...
Tennis ball patent: patents.google...
SF6 data sheet: npeinc.com/man...
SF6 worldwide usage: www.ipcc-nggip...
General adiabatic resources:
rogercortesi.co...
arxiv.org/pdf/...
isjos.org/JoP/v...
hyperphysics.ph...
/ appliedscience
That was fascinating! I knew sf6 was a good insulator for highvoltage but had no idea it had all these other interesting properties.
My favorite bit "I haven't built a mass spectrometer *yet*"
I came to the comments to add this comment.
It’s actually possible, albeit needs some precise construction. But building something like a linear trap MS should be possible I think.
we all know he's gonna do that one day :D
well of course YOU watch Applied Science :)
In a few years time he'll be demoing his garage-built anti-mass spectrometer. I just hope he doesn't unleash Xen in the process.
Imagine playing fetch with your dog using tennis balls filled with SF6. Rover chomps a bit too hard on the ball and suddenly his bark drops by an octave. 😁
Now I want to hear a Chihuahua bark with SF6.
🐕 + 📣 = 🐺
your dog goes from a chihuahua yip to a chain chomp bark from mario
And then he suffocates because he can't evacuate the SF6 from his lungs
@@AirNeat cody's lab has a video on this you can evacuate SF6 from your lungs
@@kingofgar101 You can, but you'll notice he exhales with a pretty decent amount of force. I'm talking about a dog, they wouldn't know to do that
The vintage tennis ball is from before they invented colour
Kieran Pavy lol when I was very young, I thought the past was in black and white
Back when the rainbow was black and white
Hahahahahaha, although it's actually true (kinda). The yellow neon tint was introduced in 1972 because it was easier to see in a TV
Uncle Buck we only had 2 genders back then. Good times!
Calvin & Hobbes has the definitive exposition on when the world changed to color.
This is one of the few truly great channels out there, & has been from the get go.
Which are the other few truly great ones?
@@user93237 Off hand I'd say for this general DIY/engineering/applied science type I'd say this channel & "tech ingredients" really takes the cake, though "thought emporium", "nighthawk", "thunderf00t", "practical engineering", etc. also come to mind, I found a few hundred pretty good ones over the years. Action Lab, steve mould, Vsauses & veritasium are kinda cool too. Just check my sub list if interested......theres allot of math/science/programming/consciousness/psychology/music too etc...... oh & 3Blue1brown is Top Notch if you dig math & programming. Enjoy !
Oh, I see you found allot of the same one's too. There is probably even more but honestly I get more notifications already than I even have time to watch.
He doesn't post until he has something really interesting, and when he does post, he carries you along with a story. It's great!
I'd add This Old Tony to this list of great channels. Amazing sense of humor and vid production along with really interesting content.
I think it's time to start a build series on the Mass Spectrometer
subbed
I wanted to build a simple one to be able to recognize gas mixtures with unpleasant odor in my toilet so it can turn the ventilation on :) like $500 in parts to turn the fan on instead of me
Wait, did he say 'have' or 'built' ... of course he said 'built'
@@sanches2 just buy Methane sensor from aliexpress lol
Yes! Was thinking of building a simple one myself. Electron ionization + quadrupole mass filter or TOF should be the easiest. But I doubt I could remotely achieve unit mass resolution with the tools I have. Would love to watch a series of you building one!
brilliant video.
I almost never comment on RUclips videos, but I just wanted to leave a note to say that you're an absolute inspiration! I graduated with an engineering degree but stopped after my Bachelor's degree because university just wasn't what I'd hoped it would be. I was dreaming of an environment of exploration and free inquiry and got a bunch of calculus exams instead.
The content you publish on this channel is exactly what I always wanted from my engineering program. You dive fully into a topic and share all of the interesting surprises and tidbits you learned along the way. Your subject isn't necessarily chosen for some eventual business application or profit -- it's chosen because it's fun! You're not afraid to share your mistakes or errors of judgment, which makes the findings even more valuable and helps the viewers learn too. You don't waste time with elaborate introductions or self-aggrandizement. Although the content can be quite technical, you approach it with a thoughtful and respectful tone that's neither patronizing nor intentionally obfuscated. It's perfect. You're a shining example of what engineering and science is all about.
Please keep up the fantastic work! I'll be watching!
It wasn't what you hoped it would be, BECAUSE you stopped at your B.S. Your 4 years of B.S. is to teach you the required things to be able to be in an "environment of exploitation and free inquiry." You wouldn't be able to do any of that without calculus and the dozen other courses. Those class are mainly aimed at teaching you how to use your brain. If 4 years of B.S. was too much thinking and not enough "exploitation and free inquiry," you'd not like engineering at all, because it's not all fun and games. It's sometimes doing calculations (calculus) for days/weeks/months before getting to fuck around with cool instruments and machines.
@@xenonram I disagree. its more like the adjustment bureau. They want as many people to waste their lives as possible. spin your tires in the mud, bogged down,. then you are old and dead and gone. global evil empire enslaved us and keep us dumbed down.
that's why you got to go your own way, hide from them or they waste your life and ruin you the smarter you are.
calculus isnt even the hardest part lol
@@xenonram
He said; "Exploration and Free inquiry" NOT "Exploitation" as you are putting it !!
@@Blox117 exactly, calculus is the fun part, the real issue is that silly reality, that always gets in the way of clean maths.
"a mass spectrometer would be the ideal instrument, but since I haven't built one of those YET"
what a boss
@Coma White he built his own electron microscope, so it's not like he's bragging...
@@rocketsocks actually he has all the right to brag about it, since he has actually done it lol
After hearing this, I unsubscribed just to subscribe again.
@Coma White Have you seen his channel? I have no doubt he could
I find parts of one in surplus shop....probably not hard.
I smiled as you ran through the "weight of the vacuum" segment, suspecting your debate to include it or not...kudos!
SF6 is used in my industry to extinguish electrical arcs in circuit breakers.
Came here to say the same thing. Great dielectric gas. Note when he shows the paper that discussed usage statistics, it said 31% of all SF6 was used by electric utilities!
Fascinating! Why is that?
@@zachreyhelmberger894 I think it's related to the density, but basically it is very hard to strip electrons from SF6, which means it is very difficult to make an arc jump across it. Air requires about 30kV/cm while SF6 requires three times that (or even more if it's under high pressure!)
I’ve used SF6 as a test gas in lab fume hood testing. Any fume hood that has truly hazardous biological or chemical work being done inside get tested with SF6.
So they pump SF6 in the electrical cabinets? Or the breakers are filled with it!
>..and fill it up from my tank of SF6
Of course you have a massive tank of SF6, shouldn't have been surprised
If this dude doesn't have everything he needs, he is probably going to build it anyway.
Cleiton Felipe “in the next I build a particle collider and industrial centrifuge so I can create my own SF6”
...how else do you get concentrated gasses?
@@PaftDunk specifically SF6 I mean, I imagine he has a vast warehouse with every possible gas, on the off chance he needs it
@@keco185 plz no, it's the most polluting (greenhousey?) gas in history.
"I wouldn't call it exhaustive"
Right? I'm inspired by this man's level of dedication.
This guy accomplishes more in a single experiment than I will in my entire life
I loved this pun. You are a very talented guy. Do more!
@@vonhendrik I am amazed by his doctrine
He's right. He knows he will never get to my tennis ball cemented into the basement wall.
"Have to admit I put a little bit of oxygen in here to help my chances", of course, a classic Ben Krasnow move! Love the video and super interesting as always!
Finally someone who mentions buoyancy when doing precise measurements!
This is why a kilogram of metal (or stones) is indeed heavier than a kilogram of cotton (or feathers) in atmospheric conditions.
Mass vs weight
That's why those wonderful old Mettler triple-beam analytical balances had sliding glass doors on either side; when weighing in the microgram range, one must close those doors to exclude air currents and thus eliminate buoyancy.
@@Hippiekinkster "one must close those doors to exclude air currents and thus eliminate buoyancy". I thought that it would be so that air currents don't exert downward pressure or lift on the weighing pan / substance. It was my understanding of buoyancy that it is to do with a density differential rather than the turbulence of a fluid?
062mnbc¢
Even in a vacuum chamber 1kg of metal (iron) will be slightly heavier than a 1kg bag of feathers, because center of mass is a bit closer to the earth.
It is customary to correct for the effect of buoyancy on weight measurements, for instance when a quantity of a liquid is weighed in order to know precisely its volume or density in the lab. Nice to see you mentioning and illustrating this not very much known fact. Also, this very effect makes any balance that measures force to be accurate only if the density of the stuff weighed is the same of the calibration weight; a commonly forgotten (and seldom corrected for) issue.
so what you are saying is, that damned scale was lying when it said I weigh 500 lbs!!! clearly needs to be calibrated
You can see this in the evolution of the definition of the Imperial gallon. Whereas the USC Gallon is defined by actual volume, the Imperial gallon was defined as the volume of 10 lbs of water on a balance. Before they even took to defining "water" (they didn't even know about "molecules" at the time, let alone isotopes) they specified the density of the masses on the other side of the balance.
1kg of feathers is lighter than 1kg of steel for this reason
@@10goni !? And where exactly is a feather less dense than the atmosphere?
@@humanesque it doesn't have to be
Pretty sure this guy keeps McMaster Carr in business. And I love that he doesn't have a mass spectrometer, not because he hasn't bought one yet, but because he hasn't BUILT one yet. Engineers are the best people.
If he can build a scanning electron microscope, a mass spectrometer should be doable.
Do you think McMaster doesn't get a lot of business? Because they absolutely do
@@EGL24Xx I take it the phrase 'figure of speech' isn't used in your house.
@@JakeBiddlecome it is, but he doesn't even get that much from them
I tired to order some special project parts from McMaster Carr "we only sells to businesses", um, ok, ToysAreForboys Inc., boom, shippped. Weird company.
The syringe getting lighter when pulled out is so cool! I teach high school physics, hopefully I remember it the next time I teach gas physics because that'll be a great little riddle ☺️
Cody'sLab has a video on the same phenomenon, but he demonstrated it by weighing a metal cube (IIRC) at ground level and on an airplane at cruising altitude.
Wouldn’t the extra weight be caused by more air weighing on the syringe when it’s extended?
Notice the beauty of metric units makes this fact immeditately obvious in numbers. That should silence a few of those yanks who still use those silly imperial units.
The buoyancy of the vacuum in the syringe kinda blew my mind. Neat stuff.
same, i started thinking about having my shoes filled with vacuum instead of SF6 haha
They don't use hydrogen in them anymore due to the Hindenball disaster.
I wonder how hard you'd have to whack a hydrogen-and-oxygen ball to get it to blow up.
@Robert Price
Wouldn't a ball filled with hydrogen and oxygen be awful heavy, since it would be full of...
water? LOL
GeoD
@Sunamer Z that seems kinda risky, but sure.
on a side note, it's interesting to see that sneakers literally fall apart on their own after some time.
The glues, the rubber seems to disintegrate ... due to out-gassing of those materials it seems.
I had to ditch my trusty hiking boots last year because all the rubber just fell apart over one winter (1991-2018 RIP). The leather and fabric were quite OK.
@@flowerpt why did you not have new soles installed? I've had the soles on my hiking boots replaced multiple times
oxidation?
The “pulling a vacuum changes the weight of the system” thing blew my mind. Thanks
The fact that with my ADHD I just sat here watching a 21 minute video dealing with the air inside tennis balls, is a testament to your ability to teach or explain the driest of subjects. To be clear, I’m not educated in any field near the topic of this video nor do I have interests other than killing a bit of time while I wait on a friend at the doctor office. Don’t even know why i clicked on this video. But dammit you made it worth my time and did a wonderful job all around!
Argon has 3 degrees of freedom: 3 translational, 0 rotational.
Nitrogen has 5 degrees of freedom: 3 translational, 2 rotational; plus 1 vibrational mode (at higher temperatures).
SF6 has 6 degrees of freedom: 3 translational, 3 rotational; plus several lower energy vibrational modes (accessible at lower temperatures then nitrogen).
Right, Which is why it diverges from the ideal gas law.
Yet, N2 does not "radiate" (in the IR bands, not significantly compared to CO2, H2O anyway)
@@uploadJ That is because it's symmetric stretch vibrational mode involves no dipole movement unlike the asymmetric and bending modes possible with CO2 and H2O.
This was the most interesting part of the presentation for me
as a monatomic ideal gas I find your comment to be very offensive. how *dare* you just assume how many degrees of freedom I exist in!!!
I work with equipment that has a pure argon atmosphere, so this gave me quite a lot to think about! I love your work, and your methodical approach to "weekend projects". You are an inspiration to me, sir!
Finger prints have weight. You should use gloves when weighing to 0.1 mg.
Or tongs.
Or a gun
Or a sword
Or a cannonball
Or a rosenberg anti-mass spectrometer
i think i learned more in this 20 minutes than i did in the whole of my high school chem class...
7:07 "... since I have built one of those yet...." Looking forward to that video!
I fully appreciate your analytical verification and validation of your hypotheses by utilizing "extraneous" data that was collected, specifically the rebound height of the masses. That was a very elegant confirmation.
I put a deflated football in a microwave when I was 13 yrs. old. The theory being that a packaged sandwich inflates & explodes if not opened first. The football started smoking & smelled like burnt rubber & didn't inflate. Mom was pissed too.
What an amazing experiment that touches so many theoretical fields just to get to the bottom of "something people on the internet keep saying without sources". I can't get the image out of my head of the inventor arguing with the marketing department over the merits of a tennis ball that takes forever to deflate.
I always thought tennis balls lost their bounciness because the dog chewed them.
I love when I get an opportunity to learn something new. I have never heard that there could be SF6 in tennis balls in the first place. Somehow I find the result of the experiment at least equally fascinating. I really apprceiate how much effort you put in these videos.
I really liked your explanation of the relation between chemical bonds, heat and elasticity
edit: Damn, that outro laugh will haunt me for few days.
AFAIK this "hyperbolicity" is called progression or progression rate in shock absorbing systems. This video is excellent as all of your videos are. Thanks for awesome content!
As always, very interesting and for the most part, way over my head. 😁
Thanks for sharing. 👍
Incredible work. I can't imagine how someone does this in his spare time besides a regular full time job with no team all on his own.
Simply awesome.
Would love to be on his team. Probably just get in his way and slow him down. If I was a kid, I would beg and plead to do work experience in his shop.
"Normally you would use a mass spectrometer, but since I haven't built one yet..........."
The incorporation of some humor is just what Ben needed to add to an already great channel.
You have probably already have been asked, but what education do you have? You hit about every fascinating topic I have an interest in. I'm currently in school pursuing a degree in electrical engineering. I want to know what path you took in your pursuit of an education.
I think Ben is an engineer at Google if I remember right! Not sure what sort of qualifications that requires though
Ben has a Bachelor of Science in mechanical engineering from UC Santa Barbara.
Thanks gents.
Thanks! I have a BS in mechanical engineering (UCSB), and even though I received high grades in school, I didn't feel it was very useful. I worked for a year after high school, and considered skipping college, but only briefly. I think getting a degree is still necessary to be taken seriously by some people/companies, but I wouldn't count on it as a good way to learn how to be productive. To make the most of it, I'd recommend internships, co-ops, summer jobs, and self-directed portfolio projects to get real-world experience with low commitment, and to try various different things. Beyond the type of work done in the internship, I'd recommend working at very small companies as well as very large companies, if possible, so you can experience the ends of the spectrum, and make more informed choices when you want to choose a higher-commitment career direction. Choosing professors, and networking with them, who have current real-world connections is also a good thing. You may have heard that famous quote: "don't let schooling interfere with your education" ;)
@@tiberiu_nicolae I wonder this with every video. Does Ben have a dozen patents to his name now, or what?
One of the few RUclips channels I feel smarter after watching. Fascinating stuff, thank you.
Marvelous work. I was hoping for a high speed of the fire piston though.
Wedj
Thanks for coming clean about juicing that demo at the end! Fantastic video. Just fantastic. And very nice work.
My dog is a pro in the field of tennis ball research, and he has also never heard of SF6-filled tennis balls.
That's a "fetching" story!
probably because by the time he is done the ball is destroyed, lol
Or maybe they're too bouncy for him to catch
Nice to see a Tektronix scope as I did a 5 year general apprenticeship with them in Southgate/Hoddesdon in the UK around the 70s. Fantastic experience that took me through every department in the business. That set me up to understand business as a whole which benefitted me so many times during my life. I hope they are still doing that as it set me up for life.
This gamma thing has to do with degrees of freedom of the molecules. A diatomic gas has more degrees of freedom because the molecules have asymmetry and thus can rotate, storing energy this way. The vibrational modes exists only at very high temperatures so not relevant most of the time.
It (gamma) is also known as the ratio between the heat capacities of the gas at constat volume and constant pressure.
Edit: it's gamma, not lambda
it's gamma(adiabatic coefficient), not lamba
@@Alexander_Sannikov You're right, i'll edit it.
Nice work on this one ! I can only imagine how much effort goes into pulling videos as well as the supporting documentation so I appreciate the work involved. Thanks.
So, you could use different gases in bicycle fork with air spring and get different characteristics? I wonder how noticeable the difference would be.
People actually do that with dirt bike suspension. They'll fill it with either argon or nitrogen, I can't remember which one but, the suspension performs better with it in over just compressed air.
@@Mr88eagle88 It is filled will N or Ar because they are inert, have no O2, and are larger than H and O2, expands at a constant rate vs air, higher density, and they have less water.
KAPTN KAROTCAKE nitrogen is commonly used. I think the benefit of being dry is the reason why. Dry nitrogen eliminates condensation that occurs when compressing air
Nitrogen filled tyres is a thing
Ryan Malin it reduces cavitation of the shock oil at higher temperatures I believe
In my point of view this is one of the best scientific RUclips channels. This guy is so incredibly talented!
"It's literally true" is my new favorite quote xD
Best demonstration of weight vs mass ive ever seen.
If this guy told me the world was flat, I'd probably believe him
Don't believe even him if he says that because that'd be a joke anyway.
@@750kv8 Autism is on the rise my friend; look out for it.
@@delltawnnorthri7459 - I got some. Your point?
What a great explanation for the reason that different gazes retain the energy in different ways depending on their molecular structure!
Could this be tested in mountain bike suspensions? It would be interesting to feel the difference
One of the few channels actually applying the scientific method and doing real science - very cool
I see you have a model s on slicks..... Care to explain??!?
11:37 for the less eagle-eyed
I think he made a video talking about the model s' entertainment system recently, but I haven't watched it yet. Might be relevant to your question though.
That is not a full size model s, it's a ride on toy, look at the size of the hub caps on the ground.
Good eye. Indeed, it is a kid's model S, which looks amazingly like the real thing. I've been working on a motor upgrade, with the goal of doing a video on "engineered acceleration." There are lots of videos on horsepower and torque, but I thought it would be fun to start with an acceleration requirement (eg 1g acceleration for 1 second), and work out what kind of drive system the vehicle would need. I found some very sticky go-kart tires that fit the toy car body size perfectly.
I can't wait to see that.
This is one of the few channels that I put a thumbs up even before watching it! This time I tried to drop a like in the end of the video and noticed I had already dropped one in the begining :) Thank you, amazing content.
How much did those untouched vintage tennis balls cost? This seems to have been an expensive test for you!
Deductible as "expenses" ...
All his tests seem expensive
When I was making solar cells for my final year project, we used a mixture of SF6 to etch the surface of the solar cell to reduce reflectivity. This is a "dry" etching process that is known as Reactive Ion Etching
Dang, you got a lotta balls!
That buoyancy observation with the vacuum in the syringe was awesome! What a cool find; surprised me!
Would you please do a video on graphene chemical vapor deposition?
What is that? If I may ask
i would like to do this at home
The funny thing is that the labs who do this just just the CVD furnaces for making diamonds, but they just change the gases and setting. Simply said: if you try to make CVD diamonds and you fail, you will probably get graphene.
@@nightmarethunderfist CVD is a method of depositing thin films of materials by passing a precursor gas over a hot surface to deposit a layer of material. For example trimethyl aluminium (TMA) decomposes on hot surfaces leave a film of aluminium. TMA is a precursor of aluminium. To make graphene, a carbon precursor would be needed and the substrate and process conditions would need to encourage the formation of graphene rather than amorphous carbon or diamond.
Lots of material on this already
Worthy of Boyle and Avagadro, brilliant observation, thank you.
wait hold the phone are you going to build a gas spectrometer? that would be epic
Caught that too, did ya? ;-)
I think you might be missing a part of your explanation about the different how "springy" the different gasses are. I noticed that in each trial, you held the volume of gas constant. Given differing densities, there were different masses of test gas present. Since the same force was applied, I think it is reasonable to assume that the heat entering the system in compression is the same. While your explanation suggests differing heat capacities, which is certainly valid, it does not account for the higher mass of SF6 contributing to a lower temperature increase for given heat. That said, mass changes alone cannot solely account for the results, as the effect for Ar and air would be reversed. Fantastic video!
Think you could test other gasses like this and find out which of the more commonly available gasses would make the best shock absorber, and which would make the best spring?
I was hoping he would do a piston test with nitrogen
Why should I be interested in SF6 video? 21 minutes later: WOW! More! Please.
See you next time, bye. Hahahaha.
LMAO.
I like the cut of your jib. Glad to find another good science channel to watch.
One simple question: would it make sense to pump this stuff into my car tires?
no
they'd be slightly more bouncy and it's pressure drop much slower
Nitrogen gas is easyer to get and cheaper
@@danc2014 Nitrogen won't put a hole in the ozone layer either.
Mass spectrometer would be the ideal tool.... since I HAVE NOT BUILD ONE YET..... you are a genius, really and you mame my day with this sentence. Great video, as usual!!
For sale: twenty year old sulfur hexaflouride shoes, never worn.
...Nah, doesn't have the same ring to it
Not only was this educational it was also very engaging and fun. IMO the best kind of RUclips video
Wish I had that oscilloscope. Also I couldn't hear the difference in the bounce sound between SF6 and argon :(
Argon sounded to be a slightly lower pitch.
You blow my mind, the work and effort you put in your videos is amazing
Huh, I figured the coefficient was different 'cause SF6 was denser, thus slowing down the speed of the pressure wave propagation.
I guess I'm stupid tho. Dang.
I don't think the speed at which pressure waves travel through the objects matters much at these scales
This is the first of your videos I've ever seen, and I subscribed right after the little tid-bit starting at 7:48. That blew my mind, and then seemed so obvious after you explained what was going on. I was literally giggling.
You are able to present a high level of physical science through an almost primal curiosity. You don't dumb the information down, but you also make it easy for the layperson to follow along in a recreational manner. Keep up the great work my man!!!
Video should do well since you used the word "Bouncy". :-) Another YT Trend.
Does it rank better if you double it? Bouncy Bouncy
@@gorillaau No, you end up negating the word. LOL
@@electronicsNmore I have misremembered the line from Doctor Who which was spoken by Rose Tyler after been possessed by Casandra: "It's like living inside a bouncy castle".
and if you add the word "breasts" after bouncy you get demonetized! the more you know :-)
You probably have to write it in ALL CAPS though.
As an internet commenter it is my duty to point out the slightest, completely irrelevant errors, so here I go:
A diatomic molecule cannot do the twisting motion, after all the centre of momentum/or mass needs to be stationary.
The possible modes are: 3x translations, 3x rotations, 1x vibration.
However, the rotation about its own axis is associated with an insanely small moment of inertia or is even symmetrical, so that this rotation does not contribute (at least at temperatures where the molecule stays bound/doesn't start fusing lol).
Also, the vibrational mode usually doesn't contribute, since it's states are so high in energy that they aren't populated at room temperature. That leaves 5 modes for a diatomic molecule, instead of 3 for a monoatomic one.
Awesome video, as always!
They need to put flubber into tennis balls.
The vacuumed syringe getting lighter was as interesting as the whole rest of the video on the tennis balls. And boy that piston set up measuring the gas is genius!
You said two words I've never heard said together... "Vacuum balloon."
DO THE CALCULATIONS. How big would you need a sphere to be buoyant in air. Could it be possible with modern materials?
The problem is making it structurally sound. Much harder with 1 bar pushing in
A vacuum balloon only lifts 7% more than a hydrogen one so it's not that practical
How heavy is the container? If you can make a vacuum balloon out of aerogel then it doesn't need to be very big at all.
If you assume the hollow sphere will be made from 3mm thick steel, the sphere would need to be 110.8 meters in diameter with a complete, perfect vacuum inside to be neutrally buoyant. This assumes a density of steel as 7850 kg/m^3 and air as 1.2754 kg/m^3.
This is a very underrated channel. You deserve more subscribers. Also, it is high time that you make a mass spectrometer.
You sound like Cody at the end :) Would be fun to see a collab with him
Cody is already doing co's - watch ruclips.net/video/YCL9xJtksKM/видео.html (Sulfur Hexafluoride Inside Sisters Violin)
- and I totally agree, however I fear it could end up being a 'Laurel and Hardy'/Dr. Jekyll and Mr. Hyde ting
Have you seen his latest video?
Very interesting. Yes all tennis balls were white till the 70's, tennis clothes were also pretty much all white. One ball you didn't test was vintage Tretorn "pressureless" balls. now they are filled with some foam stuff but I'm pretty sure they used to be hollow.
Cool, very interesting topic. Keep up the great job:) ☮🐱
Just want to say that your channel is amazing, and I love how you walk us through your thought processes. It's both extremely entertaining and educational. You should be really proud of what you do with these videos!
Legend has it Nerd Rage produces SF6 through natural biological processes...
He's actually an alien that can only survive in an SF6 atmosphere, so his whole lab is permanently filled with it.
So that's why his farts sound so deep and intimidating!
My favorite sentence in this?
"A mass spectrometer would be ideal for that, But I haven't built one, ... YET."
...That's Beautiful!
Wait
Did you say
Needles?
*im gonna nope it on out of here*
Another regular use for SF6 is on gas insulated substations (GIS), since it finishes voltaic arcs faster than plain air, due to its dielectric properties.
Electrostatic speakers sometimes use SF6 as a shielding gas for this reason too
Love your videos as always! Quality stuff!
How would I go about getting the patents or designs for older projects that you did. I'm trying to CAD some parts based on your designs.
Really cool breakdown of everything, you really embody the "screwing around but writing it down is science" ethos that engineers can get into. Fyi, the intensity of a hyperbolic curve is described by eccentricity (ie the sf6's force/distance graph would be more eccentric than the argon's graph), but "more hyperbolic" is definitely easier to understand if you don't know the lingo!
FIRST! Just had to do this... :-)
HEY! I'm so OLD that I first played tennis with WHITE balls that came in METAL cans!
Loved the "basso profundo" goodbye at the end!
Each time I watch a video from you I spent the whole day learning new things due to curiosity!
All of this is just amazing!
Ah, now I see why Nike never used hydrogen or Helium
Also, it's not good for business if your customers get injured by exploding shoes or float away into the stratosphere.
Greg Ewing Haha.. please tell me that’s a joke😂
Man I love your videos. Keep chasing after the things that make you curious, and sharing your discoveries with us please.
you should do a colab with smartereveryday
I am glad you brought up the green house gas factor. most don't know about that. last number i read was over 22k times stronger. SF6 was used as a dielectric, it's being phased out but theres still transformers using it.
The vacuum in the syringe kinda blew my mind but your explanation was so easy to understand!
@3:40 - Tennis balls were traditionally white, but the modern colour, known as 'optic yellow' was brought in around 1970 with the adoption of colour TV as its was easier for viewers to see (at least on the technology of the time).
Some traditional tournaments like Wimbledon held out until the mid-80s on changing the colour of ball though so those have probably been sealed for 40 years or more!