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How is a Microwave Built? Microwaves have taken household convenience to an entirely new level. They can be placed in the wall cabinets or on the top of kitchen islands. They are made from a variety materials. In 1940, the cavity magnetron tube emitting microwaves was created at Birmingham University in England. Percy Spencer discovered that this device could heat food after he watched eggs pop and corn cook. Raw Materials Microwave (MW) heating has gained immense traction in the field of material proces