Foster S4000 User Manual download pdf (Page 7)

6

EN

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

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

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.

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