What is the maximum oxygen content below...

Question 1 / 2707066636eec28f7522a1c51c6dc

Question 1 of 2707066636eec28f7522a1c51c6dc

What is the maximum oxygen content below which flaming combustion will no longer occur?

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Question 1 of 27070

Q

What is the maximum oxygen content below which flaming combustion will no longer occur?

🔍 Key Concepts

• Fire triangle: fuel, heat, and oxygen must all be present for flaming combustion • Typical oxygen concentration in air and how much can be reduced before a flame goes out • Difference between smoldering and flaming combustion in low-oxygen environments

💭 Think About

• Think about what percentage of oxygen is normally in the air and compare that with the options given • Consider at what approximate oxygen level people begin to have serious breathing problems and whether a flame can still exist at that point • Which of these percentages is commonly referenced in fire-safety training as the minimum oxygen content needed to support open flames?

✅ Before You Answer

• Know that normal air is about 21% oxygen • Recall from firefighting or shipboard safety training the usual minimum oxygen percentage quoted for sustaining a flame • Distinguish between levels that are too low for life support versus specifically too low for flaming combustion

Question 1 of 27070

Q

What is the maximum oxygen content below which flaming combustion will no longer occur?

A

1%

B

10%

C

15%

D

21%

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Question 1 / 2707066636eec28f7522a1c51c6dc

Question 1 of 2707066636eec28f7522a1c51c6dc

What is the maximum oxygen content below which flaming combustion will no longer occur?

Back

Question 1 of 27070

Q

What is the maximum oxygen content below which flaming combustion will no longer occur?

🔍 Key Concepts

• Fire triangle: fuel, heat, and oxygen must all be present for flaming combustion • Typical oxygen concentration in air and how much can be reduced before a flame goes out • Difference between smoldering and flaming combustion in low-oxygen environments

💭 Think About

• Think about what percentage of oxygen is normally in the air and compare that with the options given • Consider at what approximate oxygen level people begin to have serious breathing problems and whether a flame can still exist at that point • Which of these percentages is commonly referenced in fire-safety training as the minimum oxygen content needed to support open flames?

✅ Before You Answer

• Know that normal air is about 21% oxygen • Recall from firefighting or shipboard safety training the usual minimum oxygen percentage quoted for sustaining a flame • Distinguish between levels that are too low for life support versus specifically too low for flaming combustion