YOU CAN FIX MICROWAVE OVENS
Microwaves, Metal and Arcing
|The characteristics of microwaves make it possible to contain them within a specially constructed metal enclosure called a cavity . The microwaves bounce around this oven cavity until they are either absorbed by food or dissipate into the air. The interior metal walls of a microwave oven cooking cavity are proportioned with the energy output from the magnetron tube. In other words, the physical proportions of the cavity are tuned to the frequency of the energy, thus producing a uniform electromagnetic wave pattern. (The sealing properties of the door, which essentially appear as a metal wall to the microwaves, and the resonant characteristics of the oven cavity, will be considered in more depth in future additions). Therefore, under normal circumstances the energy reflects from wall to wall like beams of light in a mirrored room. However, if something were to disrupt that energy pattern, it would produce undesirable results, such as arcing.|
However, lightning only lasts for an instant because it discharges or neutralizes the ionized air, but an arc in a microwave oven will continue, to a greater or lesser degree, as long as the microwave energy is applied. At the very least, this can cause marring or pitting of involved surfaces, and at worst, can burn a hole right through the cavity wall.
Why do some cookbooks suggest the use of tin foil? How can TV dinners be microwaved? What about the use of metal racks? These questions and others will be answered soon...
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