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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 are microwave-safe 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
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
towards the inside of the oven by a wave
guide
and
distributed
disperser or a rotating plate.
Inside
the
oven,
propagated in all directions and reflected by
the metallic walls, thus uniformly penetrating
the foods.
the
air,
the
oven
of
foods,
thus
danger
of
bacteria
are
channelled
using
a
metallic
the
microwaves
Why the food is heated
Most foods contain water and the water
molecules vibrate with the microwaves.
The friction between the molecules generates
heat, which raises the temperature of the
foods, defrosting or cooking them or keeping
them hot.
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.
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