I'm impressed with the longevity and will try this myself ... but I am also impressed with how effectively that fog disappeared. By four minutes I could detect none at all.
When Göran Rämme tested solutions for their bubble longevity he used an interesting device that he devised. It involved a short rack that held maybe a set of 6 by 6 short vertical PVC tubes. When he lowered those tubes down, within the rack, down to the pool of bubble liquid, bubble of equal size rose up to the top of each of those tube. It was a simple move and it created many bubbles that then popped independently, resulting in an average longevity time. Such a device could straddle two separate pools and test, side by side, under identical solutions. I'm not saying that that's necessary in determining whether the PVA enhancement matters ... the difference between a four minute bubble and a 19 minute bubble, repeated by the same and different testers using similar, identical or somewhat different approaches is plenty of evidence to convince me. But I do like Göran's device and his approach.
Keep going! To consider? A bubble touching the solid side of the tray will drain much faster than a free floating bubble... especially a "freshly formed" bubble that hasn't had a chance to organize the polymer network in the film.
Thanks Keith, any idea how to keep the bubble steady in the middle of the tray? Most of the time it will float to the side after a couple of minutes. I had one that did not and that one lived well over 20 minutes.
Just a thought... it looks like those bubble domes are floating on a thin pool of water? Maybe the bubble moves (or spreads) because it is draining surfactants into the water immediately around itself, changing the local surface tension & that gets things moving. If you float the bubble domes on a thin pool of soap bubble solution instead of water would they move less?
Ah, so much for my wonderful theory! ;-) I look forward to seeing how you solve this problem because I haven't tried to solve it before. My long-lived bubble experiments had bubbles either suspended from a loop or standing on a wet surface (inverted wine glass). That said, if you really are looking for ideas to try: Covering the tray with a box to reduce air movement? Floating the bubble in a container "overflowing" with liquid so there is no solid wall for the bubble to touch? Your instincts & experiments will lead you in good directions I'm sure. Again, it will be fun to see what you discover.
I have now used a piece of sting to form a circle in the middle of the tray and blow the bubble on top of that. Seems to work very well as I just had a bubble live for 42 minutes.
I'm impressed with the longevity and will try this myself ... but I am also impressed with how effectively that fog disappeared. By four minutes I could detect none at all.
Yes, I still wonder what causes this. Since the fog is the result of vaporization and not fire, I think it might just condensate.
When Göran Rämme tested solutions for their bubble longevity he used an interesting device that he devised. It involved a short rack that held maybe a set of 6 by 6 short vertical PVC tubes. When he lowered those tubes down, within the rack, down to the pool of bubble liquid, bubble of equal size rose up to the top of each of those tube.
It was a simple move and it created many bubbles that then popped independently, resulting in an average longevity time. Such a device could straddle two separate pools and test, side by side, under identical solutions.
I'm not saying that that's necessary in determining whether the PVA enhancement matters ... the difference between a four minute bubble and a 19 minute bubble, repeated by the same and different testers using similar, identical or somewhat different approaches is plenty of evidence to convince me. But I do like Göran's device and his approach.
That is indeed a clever idea. Maybe I will give it a try during the long cold winter nights.
Keep going!
To consider? A bubble touching the solid side of the tray will drain much faster than a free floating bubble... especially a "freshly formed" bubble that hasn't had a chance to organize the polymer network in the film.
Thanks Keith, any idea how to keep the bubble steady in the middle of the tray? Most of the time it will float to the side after a couple of minutes. I had one that did not and that one lived well over 20 minutes.
Just a thought... it looks like those bubble domes are floating on a thin pool of water?
Maybe the bubble moves (or spreads) because it is draining surfactants into the water immediately around itself, changing the local surface tension & that gets things moving.
If you float the bubble domes on a thin pool of soap bubble solution instead of water would they move less?
@@KeithJohnsonBubbleguy it is soap bubble solution in the tray.
Ah, so much for my wonderful theory! ;-)
I look forward to seeing how you solve this problem because I haven't tried to solve it before.
My long-lived bubble experiments had bubbles either suspended from a loop or standing on a wet surface (inverted wine glass).
That said, if you really are looking for ideas to try:
Covering the tray with a box to reduce air movement?
Floating the bubble in a container "overflowing" with liquid so there is no solid wall for the bubble to touch?
Your instincts & experiments will lead you in good directions I'm sure. Again, it will be fun to see what you discover.
I have now used a piece of sting to form a circle in the middle of the tray and blow the bubble on top of that. Seems to work very well as I just had a bubble live for 42 minutes.