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In a conventional cooker, the heat that is
radiated through the resistances or gas
burners slowly penetrates the foods from the
outside in. Therefore, there is a great loss of
energy
in
heating
components and the containers holding the
food.
In the microwave, the heat is generated by
the foods themselves, i.e. the heat goes from
the inside out. There is no loss of heat to the
air, the walls of the cavity or the containers
(as
long
as
they
containers). This means that only the food is
heated.
To sum up, microwave ovens have the
following advantages:
1. Savings in cooking time; in general, there
is a ¾ reduction in time compared to
conventional cooking.
2. Ultra fast defrosting of foods, thus
reducing
the
developing.
3. Energy-saving.
4. Conservation of the nutritional value of
foods due to the reduction in cooking
time.
Microwave oven operating mode
The microwave oven contains a high voltage
valve called a Magnetron, which converts
the electrical energy into microwave energy.
These electromagnetic waves are channelled
towards the inside of the oven by a wave
guide and distributed using a metallic
disperser or a rotating plate.
Inside
the
oven,
propagated in all directions and reflected by
the metallic walls, thus uniformly penetrating
the foods.
Why the food is heated
Most foods contain water and the water
molecules vibrate with the microwaves.
10
the
air,
the
are
microwave-safe
danger
of
bacteria
the
microwaves
The
friction
generates heat, which raises the temperature
of the foods, defrosting or cooking them or
keeping them hot.
oven
Because heat is formed inside the foods:
The foods may be cooked without any
liquids or oils, or with very little of these;
Defrosting, heating or cooking in the
microwave oven is faster than in a
conventional oven;
The vitamins, minerals and nutritious
substances are conserved;
Neither the natural colour nor the aroma
are altered.
The microwaves go through porcelain, glass,
cardboard or plastic, but not trough metal.
For this reason, metallic containers or
containers with metallic parts should not be
used in the microwave oven.
Microwaves are reflected by metal...
...they go through glass and porcelain...
are
... and are absorbed by the foods.
between
the
molecules
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