p. 490, #1-11
is standard sea-level pressure in millibars? In inches of
In pounds per square inch?
A. Standard sea level air pressure is 1013
(millibars), which is the same as 29.92 inches of mercury or 14.7
per square inch.
2. Mercury is 13 times heavier than water. If you built a
using water rather than mercury, how tall would it have to be to record
sea-level pressure (in centimeters of water)?
A. Standard sea level pressure in
equals 76 cm of mercury. Thus, the height of standard sea level
if a water barometer is used would be 13 times higher, or 988 cm.
3. Describe the principle of the aneroid barometer.
A. An aneroid (without liquid) barometer
of evacuated metal chambers that compress as air pressure increases and
when air pressure decreases.
4. What force is responsible for generating wind?
A. The pressure gradient force causes winds
blow. Winds blow from higher pressure to lower pressure; the
the pressure difference, the greater the wind speed.
5. Write a generalization relating the spacing of isobars to the
A. Closely spaced isobars indicate a strong
widely spaced isobars indicate a light wind.
6. How does the Coriolis effect modify air movement?
A. The Coriolis effect (the deflective
of Earth's rotation) causes air to be deflected to the right of its
of motion in the Northern Hemisphere and to the left in the Southern
7. Contrast surface winds and upper-air winds in terms of speed
A. Upper air winds generally parallel the
the result of the pressure gradient force and the Coriolis effect
one another. However, near Earth's surface, friction slows the
Since the strength of the Coriolis effect is proportional to the
speed, the Coriolis effect is diminished. Consequently, the
effect can no longer offset the pressure gradient force, and the
winds blow at an angle across the isobars.
8. Describe the weather that usually accompanies a drop in
pressure and a rise in barometric pressure.
A. A drop in barometric pressure
leads to rainy or stormy weather. A rise in barometric pressure
indicates clear skies.
9. Sketch a diagram (isobars and wind arrows) showing the winds
with surface cyclones and anticyclones in both the Northern and
A. see diagram 16.8, pg. 448.
10. If you live in the Northern Hemisphere and are directly west
the center of a cyclone, what most probably will be the wind direction?
will the wind direction be if you are west of an anticyclone?
A. The winds west of a cyclone in the
Hemisphere would be northwest, and winds west of an anticyclone would
11. The following questions relate to the global pattern of air
a) The trade winds diverge from which pressure zone?
A. The trade winds diverge from the
b) Which prevailing wind belts converge in the stormy region
as the polar front?
A. The westerlies and polar easterlies
in the polar front.
c) Which pressure belt is associated with the equator?
A. The equatorial low pressure belt is
with the equator.
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