Kuppersberg HMW 969 BL [7/64] How a microwave oven works

Kuppersberg HMW 969 BL [7/64] How a microwave oven works
7
ENGLISH TECHNICAL PASSPORT
Microwave HMW 969
3. Energy savings.
4. Conservation of the nutritional
value of foods due to the shorter
cooking times.
5. Easy to clean.
how a microwave oven works
In a microwave oven there
is a high tension valve called a
magnetron which converts electrical
energy into microwave energy. These
electromagnetic waves are channelled
to the interior of the oven through
a wave guide and distributed by a
metallic spreader or through a ceramic
base.
Inside the oven the microwaves
propagate in all directions and are
re ected by the metal walls, uniformly
penetrating the food.
Why food heats up
Most foods contain water and water
molecules vibrate when subjected to
microwaves.
The friction between molecules
produces heat which raises the
temperature of the food, defrosting it,
cooking it or keeping it hot.
Since the heat arises inside the
food:
 This can be cooked with little or
no liquid or fats/oils;
 Defrosting, heating or cooking in
a microwave oven is quicker than in a
conventional oven;
 The vitamins, minerals and
nutritional substances in the food are
conserved;
 The natural colour and aroma of
the food are unchanged.
Microwaves pass through china,
glass, cardboard or plastic but do not
go through metal. For this reason,
metal containers or ones with
Microwaves are re ected by metal...
... but go through glass and china...
... and are absorbed by foods.

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