Correct me if I got anything wrong, TA!
this post was submitted on 24 Oct 2023
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There's enough nucleation points, even in a pyrex measuring cup, to avoid superheating, as long as you're just bringing it to a rolling boil at maximum (so like 3 minutes, tops), and then using it.
The real problem comes when you microwave the water for three minutes, forget about it, then microwave it again. The nucleation points you had the first time around are now too few. Now when you pour the water into another vessel - or even just jog the water in the existing vessel - it can suddenly and explosively boil over.
If you look videos up, people have been able to many times over reliably produce superheating phenomina and "bump" (the term for the explosion) boiled water in a glass cup. Just look it up, it's actually a pretty common science experiment people have shown.
Mythbusters literally did an episode on it.
Not by heating 2 cups of water, once, for three minutes they haven't.
You can literally go look it up. It's widely avaliable info. Stop spreading dangerous disinformation.
Again - the issue is all about nucleation sites. These are "points where phase transition is favored." Nucleation sites are necessary for the heated water to change from liquid to gas.
As you heat water, it will phase shift from liquid to gas beneath the surface at these nucleation sites. That's where the bubbles and the rolling boil comes from in boiling water. So long as there are sufficient nucleation sites within the water holding on to tiny bits of air - whether those are tiny variations in the surface of the container, or particulate matter - there is no danger. If the water in the container is bubbling or rolling, there is no danger of "superheating."
The danger comes when all the little air bubbles held by those nucleation sites have already been freed and left the liquid. The water is extremely hot, but it is unable to phase shift beneath its surface. Now there is danger, because there aren't any nucleation sites left. Introducing new nucleation sites (making contact with previously uncontacted upper parts of the container, adding something like instant coffee, or pouring into another container) causes the phase shift from liquid to gas to happen again, and if the added number of nucleation sites is high enough, the whole container will try to phase shift at the same time. Because the water is in a container, with an open top, the only place for it all to go is out that top, explosively, like a bullet exiting a gun.
None of the previous paragraph will happen with potable water in a household container microwaved for three minutes.
https://mythbusters.fandom.com/wiki/Microwave_Madness