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Here
is a really cool demonstration showing the distribution of microwaves inside a kitchen microwave oven.
Experimenter Zeke Kossover drilled an array of holes in an acrylic panel, into which he inserted neon bulbs. Per
Zeke, "Microwaves are invisible, so you can't see them inside microwave oven, but their presence can be detected
with neon lamps. The changing electromagnetic field from the microwaves will make charged particles move, and so
the electrons in the metal legs will move creating current. This current makes the lamps glow." You can see how
the field changes as the panel rotates, and also how the presence of a substance that absorbs the energy affects
the pattern.
This archive links to the many video and audio
files that have been featured on RF Cafe.