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Why-microwave-heated-food-cools-faster, there are two physical processes that are important in a microwave oven. first is dielectric heating: basically, the oven sets up an electromagnetic wave inside itself, and certain molecules in the food absorb energy from the wave.specifically, an absorber molecule needs a nonzero electric dipole moment, and it has to be free to rotate.liquid water is a very efficient microwave absorber, fats ...


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