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Glass turntable
Met
ai
floor
The ceramic glass turntable
of your
microwave oven lets microwaves pass
through. Then they bounce off a metal floor,
back through the ceramic glass turntable,
and are absorbed by the food.
Microwaves
may not reach the center of a
roast. The heat spreads to the center from
the outer, cooked areas just as in conven-
tional 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.
Microwaves
pass through most glass,
paper and plastics without heating them so
food absorbs the energy. Microwaves
bounce off metal pans so food does not
absorb the energy.
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