|Feb20-13, 05:57 PM||#18|
How can water do this?
I think what you are observing is this:
This video has more but please ignore everything they say, it is wildly misleading:
They claim it is an air film separating the drop from the water (Probably due to the laminar flow Prandl layer which prevents mixing and slows down air movement)
|Feb20-13, 06:51 PM||#19|
I have noticed these 'antibubbles' too. I noticed these antibubbles when I was washing dishes. Thinking they might be due to the soap, I tried to reproduce them using normal water. They could be reproduced both using normal water and with a thin film of water on top of a stainless steel surface (the sink).
A few interesting properties of these antibubbles: Their refraction index is much larger than normal bubbles, indicating that the bubbles are completely water. The bubbles move fast over the surface over the water and deflect off each other, which is characteristic of spinning tops.
So it looks to me like these are tiny balls of water which are spinning very fast, fast enough to have friction greatly reduced and for the water to float easily on top of the other water.
So my question is this:
If you can have this sort of effect with tiny balls of water, whats to stop a solid which has a great amount of spin from doing the same thing. Furthermore, if this kind of effect is possible with fluids, couldn't we use the same idea to make something float in air?
|Feb21-13, 05:59 AM||#20|
I notice lots of these balls of water running everywhere when I'm hosing the car when washing it.
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