The Lounge is rated PG. If you're about to post something you wouldn't want your
kid sister to read then don't post it. No flame wars, no abusive conduct, no programming
questions and please don't post ads.
1. The lounge is for the CodeProject community to discuss things of interest to the community, and as a place for the whole community to participate. It is, first and foremost, a respectful meeting and discussion area for those wishing to discuss the life of a Software developer.
The #1 rule is: Be respectful of others, of the site, and of the community as a whole.
2. Technical discussions are welcome, but if you need specific programming question answered please use Quick Answers[^], or to discussion your programming problem in depth use the programming forums[^]. We encourage technical discussion, but this is a general discussion forum, not a programming Q&A forum. Posts will be moved or deleted if they fit better elsewhere.
4. No politics (including enviro-politics[^]), no sex, no religion. This is a community for software development. There are plenty of other sites that are far more appropriate for these discussions. Or if you must, use the Back Room[^] - but enter at your own risk.
5. Nothing Not Safe For Work, nothing you would not want your wife/husband, your girlfriend/boyfriend, your mother or your kid sister seeing on your screen. For those discussions where you wish to be a little more frank, use the Soapbox[^]
6. Any personal attacks, any spam, any advertising, any trolling, or any abuse of the rules will result in your account being removed.
7. Not everyone's first language is English. Be understanding.
Please respect the community and respect each other. We are of many cultures so remember that. Don't assume others understand you are joking, don't belittle anyone for taking offense or being thin skinned.
We are a community for software developers. Leave the egos at the door.
I first experienced this years ago - without even a microwave - but a brand new tea kettle on a gas stove.
You can look up all the grisly details you'd find interesting, but the basic requirements for this are heating in a brand new container without any internal flaws (micro-scratches from normal use). With no irregularities, the water reaches it boiling point (not enough reason to boil, by the way) and then, added energy would cause the conversion from liquid-to-gas.
But where ? ? ? ? The microscopic scratches are places that lower the energy required to cross that gas/liquid boundary. Suppose there aren't any?
If the container's "flawless" from the point of view of the heating content, then it will just keep getting hotter, even exceeding it's boiling point at the ambient pressure. Then - you move it or the energy content gets high enough it can jump that barrier.
Once it starts - chain reaction - watch it!
This is not related to microwave heating, in particular, but the way and what we heat things in a microwave oven lends itself to this phenomenon.
I experienced it with the heater that serve my whole house, 3 storeys. The valve that should have opened when the water reached 70°C (in order to make it flow through the radiators) jammed, me and my dad were away for less than an hour... we found half of the heater plumbings torn apart and a crapton of water next to the heater building.
* CALL APOGEE, SAY AARDWOLF * GCS d--- s-/++ a- C++++ U+++ P- L- E-- W++ N++ o+ K- w+++ O? M-- V? PS+ PE- Y+ PGP t++ 5? X R++ tv-- b+ DI+++ D++ G e++>+++ h--- ++>+++ y+++* Weapons extension: ma- k++ F+2 X * Never pay more than 20 bucks for a computer game. * I'm a puny punmaker.
You kept putting energy into the water in your system without any way for it to vent. The water boiled (probably normally, except for the pressure) creating steam. As more heat was added, more steam was created and the pressure above the water kept increasing. Eventually something has to give.
Many moons ago, whilst studying German, one of the textbooks actually had bomb-making instructions (really!) - it was sealing a metal container with water and heating it until it exploded. Alternatively, think of a jammed vent on a pressure cooker (hence why they have a safety plug).
Superheating (in the context we're using) differs in that the container isn't sealed - the liquid exceeds its boiling point but is not constrained by a sealed container. It just doesn't have whats called a nucleation point to begin the phase change in a (comparatively) orderly manner.