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Microwave Microwaves are a form of energy similar to radio and TV waves. A magnet tube inside the oven changes electricity into microwaves. The waves are spread through the oven by a fan. The interior of the oven is metal, so the microwaves bounce off it and cook the food from all sides. Cook- ware for use in microwave ovens is made from glass, plastic, paper, or ceramic, as microwaves can pass through them to the food. Microwave ovens cook by acting on the fat, water, and sugar molecules in the food, making them vibrate at great speeds. This movement creates friction, which causes heat. The heat cooks the food. The micro- waves enter the food to about a depth of 1.3 to 3.8 centimeters (1/2 to 1 1/2 inches). After this, the heat is conducted throughout the food. Microwaves use radio waves at a frequency of 2,500 mega hertz (MHz) which are then absorbed by water, fats or sugars and converted directly into atomic motion – or heat. Micro waves are not absorbed by most plastics, ...