Which ventilation type results from pressure differentials due to unequal densities or weights of two air columns?

Natural ventilation occurs due to pressure differentials arising from the unequal densities or weights of two air columns. This type of ventilation relies on natural forces such as temperature differences, wind, and buoyancy, allowing air to flow into and out of an underground environment without the need for mechanical systems.

When air is heated, it becomes less dense and rises, creating a lower pressure area that draws in cooler, denser air from the surrounding surroundings. This movement creates a natural airflow, which plays a crucial role in effectively ventilating mines, particularly in locations where mechanical systems are not feasible or are impractical.

Ventilation types such as mechanical, positive pressure, and negative pressure rely on powered systems or deliberate manipulations of air pressure rather than natural processes. Understanding the distinction between these methods is vital for effective mine ventilation planning and implementation.