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Contents

Glossary

Altimeter Setting
The value of atmospheric pressure to which the scale of a pressure altimeter is set. In the United States the setting represents the pressure required to make the altimeter indicate the elevation of the airfield. This helps a pilot to know during his/her flight how high the plane is above the ground, by reading the altitude from the altimeter and subtracting the terrain elevation from the altimeter reading.

Density Altitude
The pressure altitude corrected for temperature changes from the standard atmosphere. This is used by pilots to help them judge how much runway it will take to land or take off on.

Heat Index
A combination of the temperature and the relative humidity to give a temperature of what it feels like to the human body on a hot muggy day.

Pressure Altitude
The altitude which corresponds to a given value of atmospheric pressure according to the standard atmosphere. It is the indicated altitude of a pressure altimeter set at 1013.2 millibars; therefore, it is the indicated altitude above 1013.2 millibars. Once again this is used by pilots to determine how high above the ground they are.

Pressure Unit Calculator
This tool will convert pressure from one unit of measure to another.

Relative Humidity
The ratio of the actual vapor pressure of the air to the saturation vapor pressure of the air. In other words, how much water vapor is in the air divided by how much water vapor the air could possibly hold.

Station Pressure
The atmospheric pressure computed for the level of the station elevation. It is usually used as the base value for calculating sea level pressure and the altimeter setting.

Temperature Unit Conversion
This tool will convert temperature from one unit of measure to another.

Vapor Pressure
The pressure exerted by the molecules of a given vapor. In meteorology it is almost exclusively used to show the partial pressure exerted by the water vapor in the air.

Wind Chill
The cooling effect of any combination of temperature and wind. In the U.S. this is translated into a temperature that a person might feel when he or she went outside.