The transfer of heat involving the movement of a fluid is defined as:

The transfer of heat involving the movement of a fluid is best defined as convection. In the process of convection, heat is transferred either through the movement of fluids such as liquids or gases, which circulate currents within the fluid. As a fluid is heated, it becomes less dense and rises, while cooler, denser fluid sinks. This continuous movement helps to distribute heat efficiently throughout the system.

Convection is different from conduction, which is the transfer of heat through a solid material without any movement of the material itself. Radiation, on the other hand, involves heat transfer through electromagnetic waves and does not require a medium, such as a fluid. Refrigeration relates to the process of removing heat from a space or substance to lower its temperature and is not a mode of heat transfer on its own but rather a practical application of heat transfer principles.