Microwave Oven

The invention of the microwave oven is based on the use of electromagnetic waves at specific wavelengths or frequencies. Microwaves have a frequency that allows them to penetrate food, particularly water molecules, and excite them. When a molecule is excited, the electrons orbiting its nucleus jump to higher energy levels, causing the atom to vibrate more rapidly. This increased atomic and molecular motion generates heat, resulting in a rise in the temperature of the food. The microwave oven contains a device called a magnetron, which generates the microwave radiation. These waves are then directed into the cooking chamber via a waveguide and a mode stirrer. The microwaves enter the chamber through a special channel with metallic walls that reflect the radiation within the chamber. The oven door is designed to allow users to observe the food while preventing microwaves from escaping. It is a multi-layered structure made of glass or plastic plates, with a perforated metal grid between the layers. This metal grid reflects the microwaves back into the cooking chamber, while the small perforations prevent the waves from passing through, ensuring safety while allowing visibility.