Vocabulary - Weather
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Vocabulary
STUDENT RESOURCE 7.1
INFORMATION SHEET
air pressure the force exerted by the
isobars curved lines on a weather map
weight of a column of air pushing down
that connect locations that have the
on an area; also called atmospheric or
same air pressure
barometric pressure
Iso- means “equal,” and bar means
Air has weight because of the force of
“pressure.”
Earth’s gravity pulling down on it.
liquid barometer a type of barometer
that uses a column of liquid to measure
aneroid barometer a type of barometer
changes in air pressure
that uses an airtight metal chamber to
The fi rst barometers were tubes of
measure changes in air pressure
liquid that rose and fell as air pressure
Aneroid means “without liquid.”
changed. The liquid is most often
barometer a weather instrument used to
mercury. Thus, a unit of measure for air
measure air pressure
pressure is “inches of mercury.”
A “rising barometer” indicates an
increase in air pressure and clearing
weather. A “falling barometer” indicates
a decrease in air pressure and an
approaching storm.
WEATHER AND WATER • SECTION 7 AIR PRESSURE
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