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A magnetron in the microwave oven
produces microwaves. The microwaves
move into the area under the oven floor.
There they bounce off the mixing antenna
into the oven where they contact the food.
Microwaves pass through most glass,
paper, and plastics without heating them
so food absorbs the energy. Microwaves
bounce off metal containers so food does
not absorb the energy.
Microwaves may not reach the center of a
roast. The heat spreads to the center from
the outer, cooked areas just as in regular
oven cooking. This is one of the reasons for
letting some foods (for example, roasts
or baked potatoes) stand for a while after
cooking, or for stirring some foods during
the cooking time.
The microwaves disturb water molecules
in the food. As the molecules bounce around
bumping into each other, heat is made, like
rubbing your hands together. This is the
heat that does the cooking.
NOTE: Do not deep fry in the oven.
Microwavable utensils are not suitable and
it is difficult to maintain appropriate deep
frying temperatures.
Magnetron
Mixing antenna
Oven cavity