Before entering any space that has been...

Question 1 / 205eccef9ebacbc34ba4d461b9

Question 1 of 205eccef9ebacbc34ba4d461b9

Before entering any space that has been sealed, its oxygen level should be tested. What level of oxygen in the space is equal to fresh air?

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Question 1 of 20

5eccef9ebacbc34ba4d461b9

Before entering any space that has been sealed, its oxygen level should be tested. What level of oxygen in the space is equal to fresh air?

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🔍 Key Concepts

• Safe oxygen range in breathable air expressed as a percentage by volume • Typical oxygen percentage in normal atmospheric air at sea level • Why spaces that have been sealed can become oxygen-deficient or oxygen-enriched

💭 Think About

• Think about what percentage of the air we breathe is normally oxygen at sea level—what number is commonly taught in basic safety and first‑aid courses? • Which option is closest to the normal atmospheric oxygen level, and which options look clearly too low to sustain safe entry? • Consider whether having significantly more oxygen than normal is actually safe, or if it increases other hazards like fire risk.

✅ Before You Answer

• Eliminate any option that is too low to safely support human life without respiratory protection. • Ask yourself which value matches the commonly accepted normal atmospheric oxygen level (~21%). • Verify that you are choosing a value that represents normal fresh air, not an oxygen‑enriched or oxygen‑deficient atmosphere.

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Question 1 of 20

Before entering any space that has been sealed, its oxygen level should be tested. What level of oxygen in the space is equal to fresh air?

10.0%

15.8%

20.8%

25.8%

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Question 1 / 205eccef9ebacbc34ba4d461b9

Question 1 of 205eccef9ebacbc34ba4d461b9

Before entering any space that has been sealed, its oxygen level should be tested. What level of oxygen in the space is equal to fresh air?

Back

Question 1 of 20

5eccef9ebacbc34ba4d461b9

Before entering any space that has been sealed, its oxygen level should be tested. What level of oxygen in the space is equal to fresh air?

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

💭 Think About

✅ Before You Answer

👋 Hi! I'm Genie, your AI study assistant. How can I help you with this question?

Quick actions

— No credit card needed