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Physics and Gas Laws Flashcards

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

Read the first 7 Physics and Gas Laws flashcards as text

  1. A flexible balloon contains 6 liters of air at the surface. What volume will it have at 66 feet (20 m, 3 ATA)?

    Answer: 2 liters

    Boyle's Law: V2 = (P1 × V1) / P2 = (1 × 6) / 3 = 2 liters.

  2. The term 'partial pressure' refers to:

    Answer: The pressure contributed by a single gas in a mixture

    Dalton's Law defines partial pressure as each gas component's individual contribution to total pressure.

  3. At what partial pressure of oxygen does acute CNS oxygen toxicity become a significant risk during diving?

    Answer: Above 1.6 ATA

    PADI guidelines set 1.6 ATA ppO2 as the maximum limit for recreational diving to avoid CNS oxygen toxicity.

  4. Light refraction underwater makes objects appear:

    Answer: Closer and larger than they actually are

    Due to refraction at the mask lens interface, objects underwater appear about 25% closer and 33% larger than actual.

  5. Sound travels underwater approximately how much faster than in air?

    Answer: 4 times faster

    Sound travels roughly 1,500 m/s in water compared to about 340 m/s in air — approximately 4 times faster.

  6. The combined gas law incorporates which three individual gas laws?

    Answer: Boyle's, Charles's, and Gay-Lussac's

    The combined gas law merges Boyle's (pressure-volume), Charles's (volume-temperature), and Gay-Lussac's (pressure-temperature) laws.

  7. Which factor does NOT affect the rate of nitrogen absorption in a diver's tissues according to diving physics?

    Answer: The color of the diver's wetsuit

    Wetsuit color has no effect on gas absorption; depth, time, and circulation all influence nitrogen uptake.