Can Glass Float? Glass Hot Air Balloon / Sky Lantern
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- Опубликовано: 14 май 2022
- Attempting a hot air balloon made from glass. Will my dreams of silica aloft come true, Or shatter into a nightmare? Today we ask a long standing question, can glass fly? Thinner than paper glass meets a roaring flame.
Thanks for watching!
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#Science #Glassblowing #Lampworking 
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I'm a glass artist (lampworker) and I crew for a hot air balloon here at Albuquerque Balloon Fiesta every year.
One thing I noticed was that you're trying to get lift with your balloon in the same studio you just heated the room temp up in.
You said you helped inflate a balloon once. Do you remember how cold it was in the morning compared to the heat in the balloon? There is a huge difference. Your Studio is too warm to get that thermal lift! Try again in a colder room or outside and it may work! Good luck!
Cool video thanks for sharing!
I remember reading in I think Popular Science mag prob in the early 1960's about a glass blower that was selling lighter than air glass balloons filled with hydrogen.
Fun to see someone try. But I suspect you are going to have a bad time. Since the wall shows no thin-film interference, the wall is at least ~4um. You can play around with this equation:
9.81*4/3*pi*( 2.23*( (r^3-(r-0.001)^3)) +(8.978×10^-4)*(r^3) -0.001225*(r^3) )
First term is the weight of the glass in kg, sphere of radius r in cm, and thickness 0.001cm(10um).
Second is the weight of the hot air inside the balloon @120C(a small error for simplicity)
Third is the weight of displaced air.
When this equation is less than zero you have lift. For a wall thickness of 10um, r=~20cm.
That is ~1/10 a human hair. I've used these bobbles to make windows for alpha-Geiger-tubes, and most are closer to 100um than 10um. Given a thickness of 100um you will need a sphere 4m across.
At 100um, even if you could have made it a vacuum balloon, you'd still need 1m in diameter.
Of course, these are lower estimates, since they don't include any material at the flange.
It would be mighty impressive if you could do it. But consider a compressor, since blowing a minimum of (5x)human lung capacity in one go, will be difficult. Good luck!
would it be better to use colored glass as the metals in it should help with insulating and capturing the heat for a upward draft. awsome work mate as allwase.
Thanks Zac, it took a lot of work to put this together. I did try blowing some colored orbs but it couldn't stretch as far so they were heavy. They didn't float but I never measured the lift, It would be good to compare the numbers. I'll make more balloons while its warm and test them all in winter.
Ltns Matt. Another cool project.
I didn't get around to re-testing it yet. Maybe next winter when it's really cold.
I think you might have to go the same route the MythBusters did to get a lead balloon to work. scale it up to a ridiculous degree so the weight isn't as much of a problem compared to the internal volume. Also a jet style burner like the one you used to melt glass may be easier for heat direction and increased thermal output.
I'm not sure how much heat transfer is a problem due to the general poor conductivity of air.
That is true, I was reaching my limit with how large I could be made. I was thinking of a burner as well, but I was worried the pressure of the gas would lift it without heating the air.
With the heat transfer It's something you would have had to feel for yourself. It was like nothing was there blocking the heat. My hypothesis is that the air above the vessel was as hot as the air inside, so with both regions at the same density we can't have buoyancy.
Thanks for watching and commenting. Wish me luck when I attempt the experiment again soon.
@@MattJasa I doubt that heat conductivity of glass is a main problem (at least for the first seconds) but that the lower rim end will be always too thick and heavy. Something like this would need to be made rather with NASA methods than handcrafted. But if a glass bubble would easily lift into air, I am sure it would have been mentioned already in medieval texts. Possibly it needs to be tempered glass (like optical fibers or Gorilla Glass sheets) to stay flexible; but a closed bubble (to seal helium like a balloon) likely can not work because it would implode by air pressure when cooling down. (I am a latex mystic (meditation with inflatables) and not working with glass. But your concept is very alchemistical, so I can understand the ambition.)
Matt, on that small balloon did you try your mini torch with it?
Hey Michael, it totally crossed my mind but I wanted to stick to a more traditional flame. If it has problems this winter I'll be pulling out the hand torch you bet!
Супер!!!
Thank you, this was a wild one. I've never blown such a lightweight bubble before.
Maybe you need to make a double walled balloon (a bubble inside of a bubble) so the air between them acts as an insulator. The downside is that will double the weight.
That's a cool idea. If that air chamber is sealed and vacuumed it would be very effective. Blowing a large scale balloon might be difficult, but I can craft a small scale version and test it this winter. Thanks for your comment!
Did you consider heating the air electric for testing?
No I haven't, I've been focused on flame since that's more traditional for this craft. But I love the idea of electric, that might allow for more controlled heat. I'll test electric coils this winter and compare it to flame. Thanks for the idea!
A very thin coating of insulating paint or a powder that you can apply to the inside might solve some durability and temp loss issues. Airbrush application might be a good idea. It will a bit of weight but that's what experimenting is about.