RE: [ATM] RE: glass heating

["Jerry Reddell" <jerry.p.reddell63@sbcglobal.net>]

Not really experiments, and not cooking glass just observations over many
years using cooking ware etc. And some work with RF waves inside highly
reflective enclosures.

..Some materials used in manufacture of some dishes bowls etc are not
suitable for microwave use... This is for various reasons.. Some have metal
in their make-up. Some reacted internally (obsorb energy) and become
extremely hot when compared to the items in the dish or bowl.. Some others
allow the water (items) in the dish to become very hot while the dish
remains relatively cool... Other dishes can actually break... I once had an
item literally explode..(made of plaster type material).apparently it had
water absorded within it which turned suddenly to steam and-------.
Fortunately the oven held togather.  In short, the microwave energy is
reflected about the inside of the oven until finding a material to react
(absord) with and generate heat. Those reflections cause hot spots
(focusing). If an aborbing material is at a hot spot then a larger amount of
energy is absorbed at that spot...The material's heat conduction properties
then control how uniformly heated the material becomes. When baking
potatoes, I have seen one of which becomes overdone while a smaller one next
to it is still a long ways from being done.

Apparently styro foam cups are dangerous to use for heating water etc. I
have not experience it but a friend's teenager was scalded when he took a
styrofoam cup of heated water from the microwave. Once in his hand and
turned to walk away the water in the cup erupted violently causeing bad
burns on his face and hands. I have no explaination for that event, but the
doctor that treated him said he had seen several patients who had similar
accidents.

Jerry Reddell



-----Original Message-----
From: richas@earthlink.net [mailto:richas@earthlink.net]
Sent: Tuesday, January 25, 2005 4:07 PM
To: Jerry Reddell
Cc: atm@atmlist.net
Subject: RE: [ATM] RE: glass heating


Jerry, you seem to know a lot about cooking glass in microwave ovens.   Can
you please post more information, descriptions of the experiments you did.
We can much from both successes and failures.

. . . Richard

-----Original Message-----
From: Jerry Reddell <jerry.p.reddell63@sbcglobal.net>
Sent: Jan 25, 2005 12:18 PM
To:
Cc: atm@atmlist.net
Subject: RE: [ATM] RE: glass heating

The problem with microwave ovens is that the energy gets concentrated more
in some spots than others..(Witness the bacon burned at one end and raw on
the other). This spotty heating would likely cause severe hot spots in the
glass, hence some glass is not suitable for microwave use.

I think the gas or plasma provides an efficient capture and 'distribution'
of the heating energy.

Jerry Reddell


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