Oxygen

20.34%

Nitrogen

78.768%

Methane

0.5%

Carbon dioxide

0.392%

 

100.000%

This corresponds to 97% pure air, 0.5 %, methane, and 2.5 % black-damp, as indicated below

Oxygen

20.34%

97.0% air

Nitrogen

76.63%

Carbon dioxide

0.03%

Methane

0.5%

0.5% methane

Nitrogen

2.0138%

2.5% black-damp

Carbon dioxide

0.362%

In this sample black-damp contains 14.5 %. carbon dioxide, but we may regard 13 % as the average carbon dioxide content of black-damp. About 15 to 19 %, of the gas will extinguish lights.


 

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