Yes, heat can be considered as thermal radiation, which is a form of electromagnetic radiation. However, it's important to note that not all heat transfer occurs through electromagnetic waves. Heat can also be transferred through conduction (direct contact), convection (through a fluid medium), and radiation (electromagnetic waves).
When thermal radiation occurs, the heat energy is emitted in the form of electromagnetic waves. The radiation is a result of the oscillation of charged particles at the atomic or molecular level. In the case of thermal radiation, it is primarily the oscillation of charged particles within the atoms or molecules that generates the electromagnetic waves.
At the atomic level, electrons are responsible for the generation of electromagnetic waves during thermal radiation. As the atoms or molecules gain thermal energy and their temperature increases, the charged particles within them start to vibrate or oscillate more vigorously. These oscillating charges generate electromagnetic waves, which we perceive as heat radiation.
It's worth mentioning that the specific charges and fields involved in the generation of heat radiation depend on the nature of the material and its temperature. The thermal radiation emitted by different objects can vary based on their composition and temperature.