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Microwave ovens use radio waves to convey energy at a frequency which is
approximately 2500 megahertz. Waves in this frequency range are absorbed by water,
fats and sugars and other molecules with a sufficiently polar oxygen group. In the
specific case of water which is an electric dipole (positive charge on one end and
negative charge on the other), once the electric field is induced the molecules try to
align within it; this motion and the collision with other molecules produce heat. In
other words when microwaves excite the molecules producing rotational and
translational motion; this motion is essentially heat (Buffler 1993). Heat is generated
everywhere at once because the microwave energy applied excites molecules
throughout the material. However radio waves penetrate unevenly in thick pieces,
therefore depending on the sample the microwaves sometimes do not penetrate all the way to the middle, and there is also localized heat caused by wave interference
(Buffler 1993).

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