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General information about microwaves
General information about microwaves
What are microwaves?
Microwaves are electromagnetic waves. As
with radio and TV, microwaves are also invis-
ible and intangible.
Microwaves
– are reflected by all metals,
– can penetrate glass, porcelain, plastic and
paper,
– are absorbed by foodstuffs.
What effect do microwaves
have on foodstuffs?
– The microwaves penetrate foodstuffs to a
depth of approximately 3 cm. The water, fat
and sugar molecules are heated up (dish-
es with a high water content are heated up
most quickly). This heat then slowly pene-
trates the entire dish and leads to the dish
being defrosted, heated and cooked.
– Due to the fact that the individual elements
of the dish are heated unevenly, it is impor-
tant to stir or turn the dish over to ensure
that it is cooked through evenly.
– The cooking compartment and the air
in this compartment are not heated. The
food container is primarily heated by the
hot food itself.
– When heating liquids, a so-called ‘boiling
delay’ can occur. The liquid then reaches
boiling temperature without any outward
visible sign of boiling. Even a small vibra-
tion may cause the liquid to suddenly spray
out, for example when removing it from the
microwave oven.
– Every dish requires a certain amount of en-
ergy for cooking or defrosting – a good rule
of thumb is ‘high-power, low time’ or ‘low
power, high time’.
How does a microwave oven
work?
– A microwave generator, the so-called mag-
netron, generates the microwaves and dis-
perses them into the cooking compartment.
– The cooking compartment walls and inner
screen reflect microwaves, thus preventing
them from being emitted out of the cooking
compartment.
– The microwave’s power can be set to var-
ious levels.
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