Mine Gases - No. 13
Questions and answers taken from PowerPoint Presentations found on this site.

Progress Indicator:
Question 1 of 20

1.  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.

  1. Three tenths percent (0.3%).
  2. About seventy-five hundredths percent (0.75%).
  3. About one percent (1%).
  4. Five tenths percent (0.5%).

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