1, the product of total return air volume of mine and total gas concentration of mine+total gas extraction amount of mine = absolute gas emission amount of mine.
(Of course, if it is a low gas mine, there will be no gas drainage. )
If the total return air volume is cubic meters per minute, the gas concentration is a percentage and the gas emission unit is cubic meters per minute.
Multiply the formula you provided by 60, and your unit is the air volume of cubic meters per second and the gas emission of cubic meters per minute.
2. Relative gas emission = absolute gas emission/daily output of mineral aggregate.