When temperatures are equalized in a mine, what happens to natural ventilation?

When temperatures are equalized in a mine, natural ventilation can effectively stop completely. Natural ventilation relies on the differences in air temperature, density, and pressure to create airflow within the mine. Warm air is less dense and will rise, creating a natural circulation as cooler, denser air moves in to replace it. When the temperatures are equalized, this temperature-driven pressure difference diminishes or disappears, leading to a significant reduction or cessation of airflow in the mine. Thus, natural ventilation becomes ineffective, directly impacting air quality and the working conditions within the mine.

In contrast, the efficiency or reliability of ventilation systems would not necessarily improve or increase dramatically as a result of equalized temperatures, making those options less applicable in this scenario.