What is the method of heat transfer that occurs in a line of sight between bodies of different temperatures?

The method of heat transfer that takes place in a line of sight between bodies of different temperatures is radiation. This process involves the emission of energy in the form of electromagnetic waves, which means that heat can be transferred without needing a medium or physical contact between the heat source and the recipient.

For instance, the sun radiates heat and light, which travels through the vacuum of space and warms the Earth. This process is effective even over long distances, such as from the sun to the Earth, demonstrating how radiation can transfer energy directly between objects that are not in physical proximity.

In contrast, conduction involves direct transfer of heat through physical contact of materials, while convection is the transfer of heat through the movement of fluids (liquid or gas), requiring a medium to transfer the energy. The option mentioning "conduction through air" suggests a misunderstanding, as conduction cannot effectively happen in the air without direct contact; thus, the focus on the line-of-sight aspect aligns best with radiation as the correct concept.