# What are thermal photons?

What is the difference between an ordinary photon and a thermal photon? Do thermal photons act as an exchange particle for any forces similar to an ordinary photon which acts as an exchange particle for EM interactions?

• And typical values of the energy (frequency, wavelength) are given by Wien's law, a few times $k_BT$. – Pieter Mar 20 '18 at 7:59