Which factor does not affect vapor pressure?

Vapor pressure is primarily influenced by the temperature of the substance, the nature of the liquid, and the surface area of the liquid.

When considering the volume of the container, it is important to note that vapor pressure is defined as the pressure exerted by a vapor in equilibrium with its liquid phase at a given temperature. This equilibrium is a characteristic property of the liquid itself and is independent of the volume of the container. In other words, regardless of whether the liquid is in a small or large container, its vapor pressure at a specific temperature largely remains the same as long as there is enough liquid to maintain equilibrium.

Temperature affects vapor pressure because as the temperature increases, more molecules have enough energy to escape the liquid phase and enter the vapor phase, thereby increasing the vapor pressure. Similarly, different substances have different vapor pressures due to their specific molecular properties. Additionally, a larger surface area allows more molecules to evaporate, thus increasing vapor pressure. However, the volume of the container does not directly influence the vapor pressure under equilibrium conditions.