Hi there, I was wondering from few weeks that what is a temperature? According to the classical idea, temperature is caused by the vibration (oscillation) of molecules and atoms. So, is it appropriate to ask the temperature of a single electron or few electrons? till what level temperature exists? what actually is temperature? what happens to the atoms, especially electrons, when we decrease the temperature of the system to the absolute zero, like if we cool it to near absolute zero temeprature?