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Thu, 22 Oct 1998 11:39:14 +0200 |
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Dear Beefriends
I'd like to remind you how the microwaves (MW) heat. MW is a high frequency
electromagnetic (EM) field. Every EM field induces the same frequency
electric current in any conductor placed inside the field. Flowing electric
current heats the conductor. The heating ability depends on the power of the
EM field (i.e. MW oven power), and the electroconductivity of your
foodstuff. The best electroconductors are metals. They are too good
(DANGEROUS !) to be placed in your oven. Usually your food is wet. Pure
water isn't good electroconductor. The chemical combinations ( salts,
acids,...) raise the electroconductivity and therefore the MW oven works.
The lower the electrconductivity, the deeper electric current penetrates
into a conductor. A current in the metals flow only on their surface.
Conclusion:
1. Dried foodstuff (evaporated), electric insulators ( pure wax among them)
can't be heated (from the practical point of view).
2. Low degree electric conductors (wet food) are heaten all volume
simultaneously.
3. Metal (metalized) stuff damages your MW oven.
4. A case with bee wax confirms this theory - you must add some water.
Good luck
As electronic engineer in this case :)
Rimantas Zujus
Kaunas
LITHUANIA
e-mail : [log in to unmask]
http://www.online.lt/indexs.htm
http://www.lei.lt
55 North, 24 East
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