Dissolved Gases in water depend on the chemical characteristics of the gas, atmospheric concentration, pressure, and temperature.

• A. Dissolved Gases
• B. Pathogens
• C. Turbidity
• D. Acidity

Answer: (A)

Dissolved Gases in water are determined by how gases interact with water, governed by concepts like Henry’s law: the amount dissolved depends on the gas’s chemical characteristics, the partial pressure of that gas in the atmosphere, and the temperature and pressure conditions. Different gases have different solubilities, and changes in temperature or pressure shift how much gas can remain dissolved. For example, cooler water holds more dissolved oxygen and carbon dioxide than warmer water, and higher atmospheric partial pressures push more gas into solution until equilibrium. The statement describes the factors that control dissolved gas content, so the term that fits is Dissolved Gases. Pathogens, turbidity, and acidity refer to other aspects of water quality and do not describe dissolved gas content.