Flexi Says: Vapor pressure is a measure of the pressure exerted by a gas above a liquid in a sealed container.Strong intermolecular forces produce a lower rate of evaporation and a lower vapor pressure.Weak intermolecular forces produce a higher rate of evaporation and a higher vapor pressure. As the temperature increases, the vapor pressure increases. Since liquids boil when their vapor pressures become equal to the atmospheric pressure, if the surrounding pressure is lower, the liquids will boil at lower temperatures.
