Froggit IP Observer WH2600 SE, Operating Instructions Manual, Page: 52 / 60

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6. Glossary of Terms
Term Definition
Absolute Barometric
Pressure Absolute pressure is the measured atmospheric pressure and is a
function of altitude, and to a lesser extent, changes in weather
conditions.
Absolute pressure is not corrected to sea-level conditions. Refer to
Relative Barometric Pressure.
Accuracy Accuracy is defined as the ability of a measurement to match the
actual value of the quantity being measured.
Barometer
A barometer is an instrument used to measure atmospheric
pressure.
Calibration Calibration is a comparison between measurements
–
one of
known magnitude or correctness of one device (standard) and
another measurement made in as similar a way as possible with a
second device (instrument).
Dew Point The dew point is the temperature at which a given parcel of humid
air must be cooled, at constant barometric pressure, for water
vapor to condense into water. The condensed water is called dew.
The dew point is a saturation temperature.
The dew point is associated with relative humidity. A high relative
humidity indicates that the dew point is closer to the current air
temperature. Relative humidity of 100% indicates the dew point is
equal to the current temperature and the air is maximally saturated
with water. When the dew point remains constant and temperature
increases, relative humidity will decrease.
HectoPascals (hPa) Pressure units in SI (international system) units of measurement.
Same as millibars (1 hPa = 1 mbar)
Hygrometer A hygrometer is a device that measures relative humidity. Relative
humidity is a term used to describe the amount or percentage of
water vapor that exists in air.
Inches of Mercury Pressure in Imperial units of measure.