I once was in a hurry to get out the door to a racquetball game. My
shorts were still damp and I got to thinking about how microwave ovens work
and their effects of the on water content of items. Rapidly following a
flawed string of logic I decided the microwave would a quick solution to my
problem.
Not being a complete idiot (please I know many of you will have some
pretty interesting things to say on the point but spare me for the moment if
you will!) I put them in the oven and set it for a minute. Pulled them out,
and discovered it was working, tried two minutes. - still working so now I
am on to a plan. About this time a neighbor showed up and needed some tools
in my garage. Flush with my recent success I set the ol' microwave to 5
minutes and I'm off in the garage digging for tools and pointing out to my
neighbor what a clever fellow I was.
I gave him the tools and returned to the kitchen, yanked open the
microwave and was greeted by small puffs of smoke rolling out of the oven
door. It seems I had failed to account for the nylon stitching around the
garment halves and waste band. Five minutes was enough to build enough heat
in those areas to scorch the cloth. Some of the hems were on the centerline
front to back but I was out of time; and widely thought I should be the hell
out of the kitchen before my wife discovered all of this, so off I went.
Once at the gym I put on the shorts and headed for the court. Well,
given the burn patterns a lot of folks just assumed I had the worse case of
"burrito gas discharge and vaporization" they had ever witnessed. The extra
attention didn't help my game any, and now I'm not allowed in the kitchen.
Gary
-----Original Message-----
From: Cortland Richmond [mailto:[email protected]]
Sent: Monday, April 23, 2001 7:36 AM
To: David Instone; ieee pstc list
Subject: Re: 2. 4 GHz cordless telephone, question of general interest
A lump of coal will heat up in a microwave oven. No water needed. It is the
bulk resistivity of an object which allows circulating currents to generate
heat, and while water can help (when we wet something, its chemical bonds
are a source of electrons) it is not the only thing that is heated in a
microwave oven.
The cones from our chambers don't have water in them (better not, anyway)
and they'll not only heat up in the microwave, but burn with a nasty, nasty
smell. The carbon conducts, the foam that holds it burns. Not to denigrate
water's action; I remember reading that a serviceable Radar Absorbing
Material may be made by wetting foam urethane. But the frequency of
microwave ovens wasn't chosen for resonance with water.
(PURE, distilled water is an insulator. I wonder if 2450 is close enough to
even warm it up?)
Cortland
====================== Original Message Follows ====================
>> Date: 23-Apr-01 02:07:07 MsgID: 1078-34037 ToID: 72146,373
From: David Instone >INTERNET:[email protected]
Subj: Re: 2. 4 GHz cordless telephone, question of general interest
Chrg: $0.00 Imp: Norm Sens: Std Receipt: No Parts: 1
List-Post: [email protected]
Date: Mon, 23 Apr 2001 09:05:38 +0100
From: [email protected] (David Instone)
Subject: Re: 2. 4 GHz cordless telephone, question of general interest
Reply-To: [email protected] (David Instone)
Ken Javor wrote:
>
> Just goes to show you can find anything on the net. I have measured
leakage
> from microwave ovens and every one was at 2450 MHz. And that IS a
resonant
> frequency for water and water alone. That's why you can put waterless
items
> in and they won't heat up,
Hm, now I wonder how the the totally dry and empty pottery plate I put
in the microwave to heat (before I put my non microwave cooked food on
it) gets too hot to hold after just 60 seconds at 650W.
> and also why you should never run a microwave
> oven without a water load: with no load you get high vswr and the
magnetron
> can be damaged by reflected energy.
--
Regards
Dave Instone. Compliance Engineer
Storage Systems Development, MP24/22
Xyratex, Langstone Rd., Havant, Hampshire, P09 1SA, UK.
Tel: +44 (0)23-92-496862 (direct line)
Fax: +44 (0)23-92-496014
http://www.xyratex.com Tel: +44 (0)23-92-496000
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====================== End of Original Message =====================
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