irrespirable atmosphere

irrespirable atmosphere

[i′res·pə·rə·bəl ′at·mə‚sfir]
(mining engineering)
Atmosphere in a coal mine requiring workers to wear breathing apparatus because of poisonous gas or insufficient oxygen as a result of an explosion from firedamp or coal dust, or mine fires.
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The 18 chapters cover properties of air, gases, airflow, mechanical ventilation, ventilation networks, heat, refrigeration, dust, compressed air, water, electricity, developments in ventilation, mechanized mining, protective measures in irrespirable atmospheres, noise, illumination, principles of pollution control and basic economics.