28 Sep
2012
28 Sep
'12
11:38 a.m.
On 09/28/2012 02:17 PM, David Riley wrote:
I was always under the impression that that sort of story was an urban
legend. The physics isn't out of the question, I just can't imagine
any container in a household that wouldn't provide a sufficiently
rough surface to nucleate. Surprised to hear it's a thing!
Nope, it's real. It happened to me with a glazed mug about 15 years
ago. I touched the mug and it virtually detonated. Fortunately it
wasn't very full, but it still hurt.
-Dave
--
Dave McGuire, AK4HZ
New Kensington, PA
Many years ago, I actually had a microwave
intermittently turn on by
itself... We (usually) took to leaving a jug of water in it while
quickly sourcing a replacement.
This may not be the best idea, unless your water is "dirty" (in the sense of
having something suspended that forms nucleation sites for steam bubbles). Our water is
"clean", and my wife once decided to try to heat some up in our microwave. It
superheated by a noticeable amount, then finally boiled off catastrophically. Big cloud of
steam, microwave door blown open, loud noise, 100 C water splashing around the kitchen.
There was some damage apparent later in the switch that should normally turn the thing off
when the door is open, which I eventually had to replace, but otherwise the microwave
itself was OK.