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How
Does
The
Microwave
Work?
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Microwaves
are a
form
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 is
transmitted
and absorbed.
Reflection
Microwaves
are reflected
by metal
just
as a ball is
bounced
off 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 cavitv
to
produce
even heating
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
reflect
the
microwave
energy, they
are ideal materials
for microwave
oven heatino
containers.
Absorption
During heating, microwaves
will
be
absorbed by food. They
penetrate
to
a depth of about
3/,
to
1'lz-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
friction,
and heat
is
produced
just
as
you
will leel heat
produced
if
you
vigorously
rub
your
hands
together. The
internal
heating of larger
foods is
done by
conduction. The
heat
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,
thev are not
stored in food.
Radio
Interference
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
sufaces of the oven.
See Care
of Your Microwave
Oven
found
on
page
18.)
b. Place
the
radio,
TV, etc,
away
from
the
microwave
oven
as far as
possible.
c.
Use
a
properly
installed
antenna, to obtain
stronger
signal reception.
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