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Air samples collected from the intake and the return gates of a retreating longwall face show methane concentration values of
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Answer #1

Dear student,

Quantity of methane(Q) = (15 X (0.8-0.1)) / 100

= 0.105 m3 / sec

= 9072 m3 / day

methane emission = 9072 / 2000 = 4.5 m3 / tonne

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