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The advantages of microwaves
The advantages of microwaves The advantages of microwaves
The advantages of microwaves
In conventional ovens, heat radiated by electrical
elements or gas burners slowly penetrates the food from
outside to inside. On account of this there is a major
amount of energy is wasted heating the air, the oven
components and the food containers.
In a microwave oven, heat is generated by the food itself
and the heat travels from inside to outside. No heat is
lost to the air, the walls of the oven cavity or the dishes
and containers (if these are suitable for use in
microwave oven), in other words, only the food is
heated.
Microwave ovens have the following advantages:
1. Shorter cooking times; in general these are up to
3/4 less than the time required for conventional
cooking.
2. Ultra-fast food defrosting, thus reducing the
danger of bacterial development.
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 How a microwave oven works How a microwave oven works 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 turntable.
Inside the oven the microwaves propagate in all
directions and are reflected by the metal walls, uniformly
penetrating the food.
Why food heats up Why food heats up Why food heats up 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, de-freezing 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;
•
De-freezing, 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 metal parts must not be
used in a microwave oven.
Microwaves are reflected by metal...
... but go through glass and china...
and are absorbed by foods.