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Microwave oven

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A Brief History of Microwave Ovens | The Henry Ford's Innovation Nation

A microwave oven is an electric oven that heats and cooks food by exposing it to electromagnetic radiation in the microwave frequency range. This induces polar molecules in the food to rotate and produce thermal energy in a process known as dielectric heating. Microwave ovens heat foods quickly and efficiently because excitation is fairly uniform in the outer 25–38 mm (1–1.5 inches) of a homogeneous, high water content food item; food is more evenly heated throughout than generally occurs in other cooking techniques.
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    • Other American inventions 

    • History 

    • Principles 

    • Components 

    • Heating characteristics 

    • Hazards 

    • Variations