Certified Hyperbaric Technologist Practice Test

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Study for the Certified Hyperbaric Technologist Test using flashcards and multiple-choice questions with detailed explanations. Enhance your readiness and ace your certification exam!

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What is the partial pressure of O2 at 5 ATA?

1.05 atm
0.10 atm
0.21 atm
2.10 atm

The correct answer is: 1.05 atm

To determine the partial pressure of oxygen (O2) at 5 ATA (atmospheres absolute), it is important to understand how partial pressures work in relation to total pressure. At sea level, the atmospheric pressure is approximately 1 ATA, and the fraction of oxygen in air is about 21% (or 0.21). When you increase the pressure to 5 ATA, the total pressure is 5 times the pressure at sea level. Thus, the partial pressure of O2 can be calculated by multiplying the fraction of oxygen in the atmosphere by the total pressure at 5 ATA. The calculation is as follows: Partial Pressure of O2 = Total Pressure × Fraction of O2 = 5 ATA × 0.21 = 1.05 ATA This shows that at 5 ATA, the partial pressure of oxygen is indeed 1.05 atm. Understanding this concept is crucial for hyperbaric medicine, as varying pressures can significantly affect how gases are dissolved and transported in the body, influencing the treatment of conditions like decompression sickness and carbon monoxide poisoning.