The boiling point of water depends on which of the following?

The boiling point of water is primarily influenced by the acting pressure, which is the atmospheric pressure exerted on the liquid. As pressure increases, the boiling point of water also increases. This relationship is described by the principle that boiling occurs when the vapor pressure of the liquid equals the surrounding pressure. At sea level, where atmospheric pressure is approximately 101.3 kPa (14.7 psi), water boils at 100°C (212°F). However, at higher altitudes where atmospheric pressure is lower, water boils at a lower temperature. Conversely, in a pressurized environment, such as in a pressure cooker or a boiler, the boiling point rises, allowing water to reach higher temperatures before boiling.

While heat content, total boiler heating surface, and absolute volume may have effects on the process of boiling or how water is heated, they do not directly affect the temperature at which boiling occurs under a given pressure. Therefore, the correct answer highlights the crucial role of acting pressure in determining the boiling point of water.