Vocabulary - Humidity, Dew, And Frost

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Vocabulary
STUDENT RESOURCE 2.1
INFORMATION SHEET
dew droplets of water that form when
relative humidity the amount of water
water vapor condenses on a cool surface
vapor that is part of the air, compared
Unlike precipitation, dew does not fall
with the maximum amount that could
from the sky but forms on surfaces.
be part of the air at that temperature
Relative humidity is expressed as a
dew point the temperature at which dew
percentage. When the relative humidity
forms
is high, the air feels uncomfortable.
The higher the humidity, the closer the
dew point is to the air temperature.
sling psychrometer a weather
instrument used to measure relative
frost ice crystals that form when water
humidity
vapor condenses on a surface that is at
A sling psychrometer has
or below freezing
two thermometers, one with its bulb
Frost forms when water vapor
covered in moist felt. A psychrometer
becomes a solid (ice) without fi rst
allows wet-bulb and dry-bulb
becoming a liquid.
temperature readings at the same time.
humidity the amount of water vapor
that is part of the air
Humidity varies from place to place
and from one day to the next.
WEATHER AND WATER • SECTION 2 HUMIDITY, DEW, AND FROST

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