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How is a Microwave Built? Microwaves have taken household convenience to a whole new level. They are designed to fit in wall cabinets or on top of kitchen islands. They are also made with a variety of materials. The cavity magnetron tube emitting microwaves was first developed in 1940 at Birmingham University in England. Percy Spencer discovered that this device can heat food after he watched the corn pop and eggs cook. Raw Materials Microwave (MW) heating has been gaining immense popularity in material processing due to its inherent advantages such