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Re: Glass loss question



Original poster: "Jason Petrou by way of Terry Fritz <twftesla-at-qwest-dot-net>" <jasonp-at-btinternet-dot-com>

Luc,

>Could someone explain me why
> glass is so little heated by microwave. May be get disturb by an
> electric field between 2 conductor plate and be cross by
> electromagnetic field have not the same effect on dielectric ????
> or the loss are there only in a range of frequency????
Basically, microwave magnetrons are 'tuned' to operate at the resonant
frequency of water molecules, which allows microwaves to heat up water based
substances. The reason that the glass doesnt get hot is because mcuh of the
energy is absorbed by a microwave. In a microwave the potential difference
between the food and the dielectric is essentially nothing. However, if you
put some alu foil in the glass and turn on the microwave then you will
probably kill the microwave and the glass would be very hot.

Microwaves produce an electromagnetic rather than a magnetic or electric
field, and to convert to an electric field you need metal...

Best Regards,
Jason