If a bar is heated at one end and the heat travels until the other end is hot, this process is known as:

The process described involves the transfer of heat through a solid material, which is characteristic of conduction. Conduction occurs when heat is transferred from one particle of a material to another without the movement of the material as a whole. In this case, when one end of the bar is heated, the particles at that end gain energy and begin to vibrate more rapidly. These energized particles collide with neighboring particles, transferring their energy through the bar. This continues down the length of the bar until the heat reaches the other end, resulting in an increase in temperature at both ends.

Convection, on the other hand, involves the transfer of heat through fluids (liquids or gases) due to the movement of the fluid itself, which is not applicable here as the scenario specifically describes a solid bar. Radiation refers to the transfer of heat in the form of electromagnetic waves, which does not involve direct contact and is not suitable for a solid bar scenario. Sublimation is the phase change from solid to gas without passing through the liquid state, and it does not pertain to the heat transfer process described in the question.

Thus, conduction is the only process that fits the context of heat moving along a solid bar.