Mine Gases - No. 13
Questions and answers taken from
found on this site.
Question 1 of 20
What is the least percentage of methane that can be detected with a flame safety lamp?
Although included here, flame safety lamps are no longer in use in coal mines.
Three tenths percent (0.3%).
About seventy-five hundredths percent (0.75%).
About one percent (1%).
Five tenths percent (0.5%).