Question 665 Deck Safety

The correct answer is C) 15%. Flaming combustion will no longer occur below an oxygen concentration of approximately 15%. This is because a minimum oxygen concentration of around 15% is required to sustain combustion. Below this level, there is insufficient oxygen to support the chemical reactions necessary for flaming combustion to continue. The other options are incorrect because 1% oxygen is far too low to support any combustion, 10% is still below the minimum required, and 21% is the normal oxygen concentration in air, which is well above the threshold for flaming combustion to occur.