In thermodynamics, what occurs during the process of convection?

During the process of convection, warm fluid rises while cooler fluid sinks due to differences in temperature and density. As the fluid is heated, it becomes less dense and therefore rises. When it moves away from the heat source, it cools down, becomes denser, and then sinks. This movement creates a circulation pattern that enables heat to be distributed throughout the fluid.

Understanding convection is essential in various practical applications, such as in heating systems, ocean currents, and atmospheric phenomena. The rise of warm fluid and the sinking of cooler fluid effectively transfer thermal energy throughout the system, making option C the accurate representation of this process.