How doe's a microwave oven heats water molecules? Doe's it relate to Stefan-Boltzmann law of heat transfer by radiation?

Question

anonymous · Answer

Microwaves collide with the atoms of heated material and make them move and collide to each other. All these collisions produce heat. That´s why liquids heat up more easily than solids.

festinger · Answer

Different materials absorb different wavelengths of the electromagnetic spectrum. For water one such absorption occurs a region we call microwaves. For some plastics, this wavelengths do not get absorbed at all. 

You can sort of picture it as the microwaves only affecting water molecules but nothing else. We say that the microwaves excite the water molecules.

This is slightly different from a blackbody, which simply absorbs all form of radiation incident on it.

I would say that is it not related to stefan-boltzamnn law. Stefan boltzmann law basically says how much power is radiated over all wavelengths by a blackbody at a certain temperature.