Cooking Food Food is cooked to Prevent food poisoning by killing micro organisms. To make it more tasty and easy to eat To preserve it To make it easier.

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Presentation transcript:

Cooking Food Food is cooked to Prevent food poisoning by killing micro organisms. To make it more tasty and easy to eat To preserve it To make it easier to digest So it is easier to absorb the nutrients To reduce the bulk.

Heat transference  Heat transference changes food physically and chemically.  Heat can be transferred using wet or dry methods.  When you heat /cook food you often use more than one method.

Conduction  In conduction the molecules are heated and begin to vibrate faster and so the bump into the next molecule and pass on the energy. This usually takes place in a pan or inside the food.

Convection Convection takes place in the air or in a liquid. As the molecules become hotter they rise and then fall when they become cold again. In a pan of boiling water you can see the hot liquid rising and the bubbles bursting on the top. Convection takes place in the air of the oven, in water and in hot fat.

Radiation  Radiation is the transfer of energy from a heat source such as a grill to the food.  The radiation waves usually travel in a straight line. The centre of the food is then cooked by conduction.

Microwave This is a different type of radiation wave as it travels deeper into the food. Electricity is converted into microwaves by the magnetron. The microwaves travel 5cm into the food. They then make the water molecules vibrate which causes friction which then makes the heat. Hot spots can be found inside of the food so it is important to stir the food or leave it to cool before eating.