Humidity refers to the amount of water vapor in the atmosphere. The water vapor pressure measures the amount of water vapor in the air. The saturation vapor pressure is the vapor pressure when water vapor begins to condense to liquid. The relative humidity is the fraction of water vapor pressure over saturation vapor pressure. Basically, as the air becomes more humid the air vapor is becoming more saturated with water. This is cause by the water cycle because under the heat of the sun, water evaporates into vapor. As more water evaporates the air molecules become more saturated–humidity increases. Then the water condenses as it rises, because of the increase in atmospheric pressure, causing precipitation.
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