Quote Originally Posted by 9ski9
A microwave oven works by passing microwave radiation at a frequency of 2450 MHz through the object you want to "cook". Water, fat, and sugar molecules absorb energy from the microwave beam in a process called dielectric heating. Most molecules are electric dipoles, meaning that they have a positive charge at one end and a negative charge at the other, and therefore vibrate as they try to align themselves with the alternating electric field induced by the microwave beam. This molecular movement creates heat.
I love scientific explanations!