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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 metaljust
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
cavity 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
oo
not
absorb
or
reflect
the
microwave
energy,
they
are ideal
materials
for
microwave
oven
heating
containers.
Absorption
During
heating,
microwaves
will be
absorbed
by
food.
They
penetrate
to
a depth
of about
3/olo
1ll
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
feel
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
Eadh's
surface,
they
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
surfaces
of
the oven.
(See
Care of Your
Microwave
Oven found
on
page
17.)
b. Place
the radio,
TV,
elc. away
from
the
microwave
oven as lar
as
possible.
c. Use a
properly
installed
antenna,
to obtain
stronger
signal reception.
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