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How your microwave
oven works
Microwave ovens are safe. Microwave energy is not hot. It causes food to make its own heat, and it’s this
heat that cooks the food.
Mode mlxef
Glass Tray
Microwaves are like TV waves
or light waves. You can’t see
them, but you can see what
they do.
Metal Fioor
A magnetron in the microwave
oven produces microwaves. The
microwaves move into the oven
where they are scattered or
stirred by a mode mixer (like a
fan). Microwaves bounce off
metal oven walls and are
absorbed by food.
Microwaves pass through glass,
paper and most plastics without
heating them so food absorbs
the energy. Microwaves bounce
off metal pans so food does not
absorb the energy.
Microwaves may not reach the
center of a roast. The heat
around the outside is what
cooks the roast all the way
through. This is one of the
reasons for letting some foods
(roasts, baked potatoes) stand
for a while after cooking, or for
stirring some foods during the
cooking time.
The glass tray of your
microwave oven lets
microwaves through. Then they
bounce off a metal floor, back
through the glass tray and are
absorbed by the food.
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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.
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