Question 5029 of 223 · California Water Treatment Operator Exam
What does an oxygen reading of less than 19.5 percent in a confined space mean?
Exactly one answer is correct.
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Correct answer to question 5029
- A: The atmosphere is oxygen deficient and entry is unsafe
Explanation
Normal air has about 20.9 percent oxygen. Below 19.5 percent is considered oxygen deficient.
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