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The amount of water vapor that the air can hold depends on temperature. Dry air causes many health problems during the winter, including dry skin and rashes, sore throats and coughs. With the Vapor Pressure of Water: Effect of Temperature—ChemTopic™ Lab Activity, determine the vapor pressure of water at different temperatures. As temperature increases in a closed system, the air in the graduated cylinder expands and becomes saturated with water vapor. Measure the volume of gas at temperature intervals as it is cooled until the vapor pressure of water is so low at freezing that it contains no water vapor.