Topic summary
Microwave heating

Extracted from the Wikipedia article Dielectric heating.
Microwave heating
Microwave heating, uses a higher frequency, so that an electromagnetic wave can be launched from a small dimension emitter and guided through space to the target. Modern microwave ovens make use of electromagnetic waves with electric fields of much higher frequency and shorter wavelength than RF heaters.This provides for highly efficient, but less penetrative, dielectric heating. The limited pentration depth can limit the use of microwave processes on large scale. Microwave flow reactors can overcome this limitation for some applications. Typical domestic microwave ovens operate at 2.45 GHz, but 915 MHz ovens also exist.