Microwaves are used today for such purposes as radar, radio and television broadcasting, cellular telephones, and microwave heating (see below).
Microwave heatingA microwave oven (see diagram) exploits the presence of water in food to cook things from the inside. A microwave oven generates microwaves in a magnetron (1). When the microwaves penetrate the food, they cause water molecules (2), which have a positive side and a negative side, to rotate (3) generating heat through friction with the food. The oven is heavily insulated (4) to prevent leakage of microwaves. A rotating plate (5) and paddles (6), which ensure an even distribution of microwaves and that the food cooks evenly. To dissipate the hot air, generated by cooking and by the magnetron, a fan (7) pushes cold air around the oven.
Related entry microwave window
Related categories WAVES AND WAVE PHENOMENA
ELECTRICITY AND MAGNETISM
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