Practice Test Geeks(CHT) Certified Hyperbaric Technician Practice Test
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CHT Physics & Gas Laws in Hyperbaric Medicine Flashcards

6 cards from real CHT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. According to Boyle's Law, if pressure in a hyperbaric chamber doubles, the volume of a trapped gas will:

    Answer: Halve

    Boyle's Law states that at constant temperature, pressure and volume are inversely proportional, so doubling pressure halves the gas volume.

  2. At 2 ATA breathing 100% oxygen, the partial pressure of oxygen is approximately:

    Answer: 1520 mmHg

    At 2 ATA, PO2 = 2 × 760 mmHg = 1520 mmHg, since partial pressure scales directly with absolute pressure.

  3. Henry's Law is most relevant in hyperbaric medicine because it explains:

    Answer: Why more oxygen dissolves in blood at higher pressures

    Henry's Law states that the amount of gas dissolved in a liquid is proportional to its partial pressure, explaining increased plasma oxygen dissolution during HBOT.

  4. Dalton's Law of Partial Pressures states that:

    Answer: Total pressure equals the sum of partial pressures of each component gas

    Dalton's Law states that the total pressure of a gas mixture equals the sum of the individual partial pressures of each component gas.

  5. One atmosphere absolute (1 ATA) is equivalent to approximately:

    Answer: 14.7 psi

    1 ATA equals approximately 14.7 psi (pounds per square inch), which is standard sea-level atmospheric pressure.

  6. Every 33 feet of seawater (fsw) of depth adds how much pressure?

    Answer: 1 ATA

    Every 33 fsw adds 1 ATA of gauge pressure, so a patient at 33 fsw depth experiences 2 ATA absolute (1 atmospheric + 1 from depth).