| definition |
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DEWPOINT HYDROMETERS are instruments used for determining the
dewpoint (the temperature at which a given air parcel must be
cooled at constant pressure and constant water vapor in order
for saturation to occur); a small temperature sensor is embedded
on the underside of a mirror and the electro-optical system is
used to detect the formation of condensate or dew; specular
reflectance of the bare mirror decreases the dew layer
thickness.
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