my theory of temperature is that all atoms have a specific resonant frequency that is in the infrared spectrum. IR waves hitting atoms cause them to start vibrating just like how glass can vibrate from sound waves. the atoms emit the IR waves back out which causes near by atoms to start shaking as well. the thermal conductivity depends on what the resonant frequency of an atom is

>>16695939 (OP)
trvthnvke

>>16695939 (OP)
Now define what temperature and thermal conductivity actually are and how to derive them from the properties of the material.

>>16695939 (OP)
Sure, now explain why different materials have different conductivities. Start with simple ones: Pure metals, like pure gold or iron.

>>16696942
Electron density?
>>16695939 (OP)
Sounds fine to me.