Originally Posted by YT2095
using a MW, you`ll make pockets of Super heated water (water that is above 100c) left undisturbed this pocket will eventually dispate it`s heat to the surrounding water, but if you add Any sort of nucleation site, Bubbles of steam will form and you`ll get a cascade reaction.
And the nucleation site does not need to be a 'solid'.
On several occasions I super heated water in a large glass mug. Upon removing the mug from the microwave I would tilt the mug away from me slightly and give it a light 'rap' on the counter .... Voosh! .... Tap it again and smaller Voosh. Seemed to come from the center or middling areas of the water, I wasn't getting down there to look, I'm ugly enough.
I read a while back there was a theory that liquid water behaves as a solid until an external force moves it. I believe the theory was van der Waals
forces formed blocks or masses in a liquid at rest. When water is disturbed the relatively weak forces are overcome and water acts like a liquid again. And that's called liquefaction or, as I like to call it, the ketchup effect.
I'm guessing the van der Waal forces need overcome for water to become self nucleating.
Sounds like a Google search.