微波是一种高频电磁波，其频率范围在３００～３０００００兆赫，波长１μ～０－０１ｍμ。微波加热，就是通过微波发生器产生一个高频振荡的交变外加电磁场，它与放置在其空间中的物质分子直接作用，物质所吸收的电磁能按能量守恒定律转化为分子热运动的动能，使物质分子运动 Microwave is a kind of high frequency electromagnetic wave whose frequency range is 300 ~ 300000 MHz and wavelength is 1μ ~ 0-01mμ. Microwave heating, is through the microwave generator to produce a high-frequency oscillation of alternating external electromagnetic field, which placed directly in the space of the material molecules, the electromagnetic energy absorbed by the material according to the law of conservation of energy into molecular kinetic energy of thermal motion, Make matter molecules move