What type of air movement does the Stack Effect describe?

The Stack Effect, also known as the chimney effect, is primarily driven by temperature and buoyancy. This phenomenon occurs when warm air rises in a structure and creates a pressure difference that draws in cooler air from lower areas. As the temperature of the air increases, its density decreases, leading the warm air to rise and exit from higher openings. This upward movement allows cooler, denser air to be drawn in from the lower parts of the building, creating a continuous flow. This mechanism is especially relevant in buildings with multiple stories or in tall structures.

Understanding the Stack Effect is crucial in building design and ventilation systems, as it impacts air quality, energy efficiency, and thermal comfort within indoor environments. The other options do not accurately capture the primary drivers of the Stack Effect. For instance, while pressure-related air movement is a component of various airflow dynamics, it does not exclusively define the Stack Effect as the primary drivers are temperature and buoyancy. Similarly, wind-driven air movement pertains to external environmental factors and not the internal thermal behavior represented by the Stack Effect. Humidity-related air movement, while important in other contexts, does not play a central role in the definition of the Stack Effect.