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À´×Ôhttp://en.wikipedia.org/wiki/Microwave_oven
Principles
For more details on this topic, see dielectric heating.
A modern microwave oven
A microwave oven works by passing non-ionizing microwave radiation, usually at a frequency of 2.45 gigahertz (GHz)¡ªa wavelength of 122 millimetres (4.80 in)¡ªthrough the food. Microwave radiation is between common radio and infrared frequencies. Water, fat, and other substances in the food absorb energy from the microwaves in a process called dielectric heating. Many molecules (such as those of water) are electric dipoles, meaning that they have a partial positive charge at one end and a partial negative charge at the other, and therefore rotate as they try to align themselves with the alternating electric field of the microwaves. Rotating molecules hit other molecules and put them into motion, thus dispersing energy. This energy, when dispersed as molecular vibration in solids and liquids (i.e., as both potential energy and kinetic energy of atoms), is heat.

Microwave heating is more efficient on liquid water than on frozen water, where the movement of molecules is more restricted. It is also less efficient on fats and sugars (which have a smaller molecular dipole moment) than on liquid water.[10] Microwave heating is sometimes explained as a resonance of water molecules, but this is incorrect: such resonance only occurs in water vapor at much higher frequencies, at about 20 GHz.[11] Moreover, large industrial/commercial microwave ovens operating at the common large industrial-oven microwave heating frequency of 915 MHz¡ªwavelength 328 millimetres (12.9 in)¡ªalso heat water and food perfectly well.[12]
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4Â¥: Originally posted by ¹ùµÂ¸Ù at 2012-11-05 18:06:38
È·¶¨Ö»ÓÐË®·Ö×Ó´øÓÐÕý¸ºµçºÉÂ𣿠ʳÎïÖÐÆäËû²¿·Ö·Ö×ÓÓꬵçºÉµÄÂð£¿

Please refer to the third post in english.
The mechanism is called dielectric heating and water is only one kind of the dielectric molecules which exists mainly in food.
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