Certified Hyperbaric Technologist Practice Test

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What affects the solubility of a gas in a liquid according to Henry's Law?

  1. The temperature of the gas

  2. The pressure exerted by the gas above the liquid

  3. The viscosity of the liquid

  4. The density of the gas

The correct answer is: The pressure exerted by the gas above the liquid

The solubility of a gas in a liquid, as articulated by Henry's Law, is fundamentally influenced by the pressure exerted by the gas above the liquid. Henry's Law states that the amount of dissolved gas in a liquid at a given temperature is directly proportional to the partial pressure of that gas in the atmosphere above the liquid. As pressure increases, more gas is forced into the liquid, enhancing its solubility. For instance, in practical applications like hyperbaric medicine, increasing the pressure within a chamber allows for a greater amount of oxygen to dissolve in the blood plasma, thereby enhancing the efficacy of hyperbaric oxygen therapy. Thus, the correct understanding of this law highlights the significant role of pressure in determining gas solubility in liquids.

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