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Microwave oven working principle


Posted Date: 04-Oct-2008  Last Updated:   Category: How things work    
Author: Member Level: Silver    Points: 1



Hi pals....
We sue microwave oven in our day to day life without knowing the principle behind it..
This article is to share how a microwave oven works... and what it does actually.....
Microwaves fall into the radio frequency band of electromagnetic radiation. Microwaves should not be confused with x-rays, which are more powerful.Microwaves are produced inside the oven by an electron tube called a magnetron. The microwaves bounce back and forth within the metal interior until they are absorbed by food. Microwaves cause the water molecules in food to vibrate, producing heat that cooks the food. That's why foods high in water content, like fresh vegetables, can be cooked more quickly than other foods. The microwave energy is changed to heat as soon as it is absorbed by food. Thus, it cannot make food radioactive or contaminated. lthough heat is produced directly in the food, microwave ovens do not cook food from the inside out. When thick foods like roasts are cooked, the outer layers are heated and cooked primarily by microwaves while the inside is cooked mainly by the slower conduction of heat from the hot outer layers.

Microwave cooking can be more energy efficient than conventional cooking because foods cook faster and the energy heats only the food, not the oven compartment. Microwave cooking does not reduce the nutritional value of foods any more than conventional cooking. In fact, foods cooked in a microwave oven may keep more of their vitamins and minerals, because microwave ovens can cook more quickly and without adding water.

Glass, paper, ceramic, or plastic containers are used in microwave cooking because the microwaves pass through them. Although such containers cannot be heated by microwaves, they can become hot from the heat of the food cooking inside. Some plastic containers should not be used in a microwave oven, as they can be melted by the heat of the food inside.
Hope this article would have helped the ones who are unaware of microwave oven cooking


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