In all kinds of heat conduction methods, in what form does thermal radiation transfer heat?

Heat conduction is a heat transfer phenomenon when there is no macroscopic movement in the medium, which can occur in solids, liquids and gases, but strictly speaking, it is only pure heat conduction in solids. Even if the fluid is at rest, natural convection will occur due to the density difference caused by temperature gradient, so thermal convection and heat conduction occur simultaneously in the fluid.

Thermal convection, also known as convective heat transfer, refers to the heat transfer process caused by the relative displacement of particles in the fluid and is one of the three ways of heat transfer.

Thermal radiation, the phenomenon that an object radiates electromagnetic waves because of its temperature. One of the three heat transfer modes. All objects whose temperature is higher than absolute zero will produce thermal radiation. The higher the temperature, the greater the total radiation energy and the more short-wave components.

2. Difference: Heat conduction is the process of transferring heat energy from high temperature to low temperature; Thermal convection is the process of heat transfer through flowing medium; Thermal radiation is the phenomenon that an object radiates electromagnetic waves due to its temperature, and it is the only way of heat transfer in vacuum.