Certified Hyperbaric Technologist Practice Test 2025 – Comprehensive Exam Prep

Question: 1 / 625

If a carbonated drink has 10cc of dissolved gas at 2 ATA, how much gas remains in solution when it reaches sea level?

5cc

When a carbonated drink is at 2 ATA (atmospheres absolute), it can hold more dissolved gas compared to sea level, which is at 1 ATA. The solubility of gas in a liquid is proportional to the pressure of that gas above the liquid.

According to Henry's Law, the amount of gas that can remain dissolved is directly related to the pressure. At 2 ATA, the drink has absorbed 10cc of dissolved gas. When the pressure is reduced to 1 ATA, the solubility of the gas decreases.

As pressure decreases, the dissolved gas will start to come out of solution until equilibrium is reached at the lower pressure. In this scenario, approximately half of the dissolved gas will remain in solution at 1 ATA, resulting in 5cc of gas remaining dissolved when the drink is opened at sea level.

This reflects the principle that solubility decreases with a decrease in pressure, which explains why 5cc is the amount of gas left in solution compared to the original 10cc at the higher pressure.

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