A jar (Petri dish I think it was) 1/2 full of liquid A. A single drop from an eyedropper charged with liquid B was dropped in the middle of liquid A. Immediately, liquid B dispersed to the sided of the Petri jar (ie horizontally)!
It could be something dispersed from liquid A to the sides - am not sure. But the effect was dramatic anyway. Wish I could recall what the liquids were - or even what the experiment was all about. Anyone?
Did I just imagine it all!
Sounds like the physics experiment to measure the surface area a single drop of oil spreads to, in a container where the surface of the water was dusted with lycopodium powder, and hence estimate the molecular thickness of the oil film.
on 26/10/2016, michael newport supposed :
A thin film of oil on water, with a detergent mix in B?
That's what I thought. Detergent breaking surface tension, or something.
Cheers
Dust/pepper on water, pulled to the sides by detergetn?
Thomas Prufer
I caught sight of this in the column of Youtube videos down the side:
No water repellent can do this sort of thing. I still find that plastic foam demo in a paper cup rather creepy myself. The nylon thread one is pretty cool though.
Brian
But fails as no 'sticky back plastic' present!
Here's an interesting project that uses some of that to extend the viewable screen area on a laptop.
Upcycling never looked so good!
Bit too much glue for my liking.
Ah - great replies tvm - it was real. I did look for it first 'onest
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