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a. In a mine, air returning from the workings to the surface via the
upcast shaft can be of a higher temperature than the air in the downcast
shaft because of heat added to the ventilation current from the strata
exposed in the mine. Thus, even in a mine with the fan stopped, the upcast
air density is less than the downcast air density. This lack of balance in
the two vertical air columns produces a pressure difference across the
shaft bottom doors known as natural ventilating pressure.
Roberts, 1
b. The ventilating pressure that produces natural ventilation.
BS, 8
Source:
Dictionary of Mining, Mineral, and Related Terms
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