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The amount of water vapor in air is its humidity; the water condenses when the temperature reaches its dew point.

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Humidity is a measure of how much water vapor is in the air.

What type of weather patterns would be expected in an area of high humidity?

Relative Humidity

Relative humidity is how much water the air around it can "hold".

What is relative humidity dependent on? 

Applications of Humidity

Heat index is a measure of how hot the weather will feel with regards to humidity. 

Humidity affects the temperature that humans will "feel" because humans relieve themselves of excess body heat through sweat. In humid climates, the air is already so saturated with water that it's more difficult for sweat to evaporate versus in a dry climate. 

Dew point is the temperature at which water vapor in the air condenses. How does dew point tie into humidity?

For guidance answering the questions in this guide, look here.

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