Convection is a fundamental mechanism of heat and mass transfer that occurs through the movement of fluids, such as liquids or gases. It involves the transfer of thermal energy when heated fluid becomes less dense and rises, displacing cooler, denser fluid that sinks to take its place. This continuous cyclic motion establishes convection currents, which are responsible for distributing heat throughout a system. The effectiveness of heat transfer via convection depends on the density gradient of the fluid, and the process is essential in large-scale natural phenomena, such as the circulation of the atmosphere or the movement of currents within oceans, as well as in engineered systems like HVAC cooling.