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Microwaves are a
torm
of high frequency radio
waves similar to those used by a
radio
including
AM,
FM
and CB.
They
are, however, much shorter
than
radio waves;
approximately
five
inches long.
Electricity is converted into microwave
energy by
the magnetron tube. From the magnetron tube,
microwave
energy
ls
transmitted and absorbed.
Reflection
lvlicrowaves are retlected by metal
just
as a ball is
bounced otf a wall. A
combination of stationary
(interior
walls) and rotating
antenna,
located
underneath the bottom shelf assure that the
microwaves
are well distributed within the
oven
cavity to
produce
even healing or cooking
of
foods.
Transmission
Microwaves
pass
through some materials
such as
paper,
glass
and
plastic
much like
sunlight shining
through
a
window. Because these
substances do
not
absorb
or
reflecl the microwave energy,
they
are ideal materials for microwave
oven heatino
contarners.
Absorption
During heating, microwaves will
be
absorbed by
food. They
penetrate
to a depth ol aboul %
to 1'A
inches. Microwave energy excites the molecules
in
the
food
(especially
water, fat and sugar
molecules),
and causes
them to vibrate at a rate of
2,450,000,000
times
per
second.
This vibration
causes
triction,
and
heat is
produced
just
as
you
will
feel
heat
produced
if
you
vigorously rub
your
hands together. The internal heating ot larger ioods
is
done by conduction.
The heal which is
produced
by
friction
travels by conduction
to the center of the
food. Foods also continue to heat by conduction
during
standing
time.
Because
microwaves dissipate, much like sunlight
as
it reaches the
Earth's surface,
they are not
stored
in food.
Radio lnterference
1.
Operation of
the microwave oven may cause
interference to
your
radio,TV or similar equipment.
2.
When
there
is interference, it may be reduced or
eliminated by
taking the following measures:
a. Clean door and
sealing surtaces of the oven.
(See
Care
of Your Microwave
Oven
lound on
page
17.)
b.
Place the radio, TV, etc. away from the
microwave oven as tar as
oossible.
c. Use
a
properly
installed antenna, to obtain
stronger signal reception.
-5-
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