Page 235 - Advanced Mine Ventilation

Origin of Gases in Coal Mines
Density TLV-C TLV-STEL TLV-TWA ppm ppm ppm Effects Harmful lb/ft 3 e e e Nontoxic 0.083 e e e simple Nontoxic, 0.073 asphyxiant e 15,000 5,000 increased Asphyxiant, 0.115 respiration 20,000 e e explosive Asphyxiant, 0.042 e e e explosive Asphyxiant, 0.080 e 400 50 explosive Toxic, 0.073 e

Gravity

Gases Specific 1) [ (Air 1.1056 0.9673 1.5291 0.5545 1.03 0.9672 1.1912 2.2636 1.5895 0.0695

Mine

Common Symbol C 2 H 6 NO 2

of O 2 N 2 CO 2 CH 4 CO H 2 S SO 2 NO, H 2 USA.
Properties monoxide sulfide nitrogen Ohio, Cincinnati,

13.1 dioxide dioxide of
Table Name Oxygen Nitrogen Carbon Methane Ethane Carbon Hydrogen Sulfur Oxides Hydrogen Hygienists,