Background

Microwaves are actually a segment of the electromagnetic wave spectrum,
which comprises forms of energy that move through space, generated by the
interaction of electric and magnetic fields. The spectrum is commonly
broken into subgroups determined by the different wavelengths (or
frequencies) and emission, transmission, and absorption behaviors of
various types of waves. From longest to shortest wavelengths, the spectrum
includes electric and radio waves, microwaves, infrared (heat) radiation,
visible light, ultraviolet radiation, X-rays, gamma rays, and
electromagnetic cosmic rays. Microwaves have frequencies between
approximately .11 and 1.2 inches (0.3 and 30 centimeters).

Microwaves themselves are used in many different applications such as
telecommunication products, radar detectors, wood curing and drying, and
medical treatment of certain diseases. However, certain of their
properties render them ideal for cooking, by far the most common use of
microwave energy. Microwaves can pass through plastic, glass, and paper
materials; metal surfaces reflect them,

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