OVEN
An oven is an enclosed compartment for heating or baking. It is commonly uses in pottery are also known as kilns. In cooking it uses for roasting and heating.
There are two kinds of oven, conventional oven and microwave oven. In conventional oven heat energy produced by heat source heats up the air in the oven first, then the air with the heat emitted from the heat source will heat the wall where the food and the top of the food, then the heat will spread to the inside of the food.
Microwave ovens emit electromagnetic waves of energy through the food directly and then heat the food from the inside. Thus, the cooking becomes more efficient, and the nutritional value of food can be more awake because the food did not experience excessive heating. The created by Dr. Percy Spencer in 1946 has now spread around the world.
Sourch:
http://en.wikipedia.org/wiki/Oven
http://id.articlesnatch.com/Article/Story-of-the-Microwave-Oven/222581
http://www.bursainternet.com/Pemakaian-Oven-Microwave.html
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