Exam 2 Review Exam Questions And Correct Answers Success Guaranteed.
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EIND
How does Dalton's law apply to the atmosphere? - correct answer Dalton's law states that the total pressure exerted by a mixture of gases equals the sum of the
pressures produced by each constitute gas. The pressure balance is a condition in the atmosphere
bec...
How does Dalton's law apply to the atmosphere? - correct answer Dalton's law
states that the total pressure exerted by a mixture of gases equals the sum of the
pressures produced by each constitute gas. The pressure balance is a condition in the atmosphere
because at any point in a gas, or a mixture of gases, pressure is exerted equally in all directions.
Provide a definition of air pressure that applies to Earth's surface and any altitude within the
atmosphere. - correct answer The air pressure at a given location on Earth's surface
can be thought of as the weight per unit
area of the column of air above that location. The pressure at any point within the atmosphere is
equal to the weight per unit area of the atmosphere above that point.
Compare the advantages and disadvantages of mercury barometer versus an aneroid
barometer. - correct answer An aneroid barometer is more portable but less
accurate than a mercury barometer.
Explain how air pressure tendency can be a useful indicator of future weather. - correct answer
As a general rule, the weather becomes (or remains) fair as air pressure at Earth's surface rises
and the weather turns stormy as the air pressure falls. Pressure tendency is an indication of an
approaching low pressure (stormy weather) system or an approaching high pressure (fair
weather) system.
Air is a compressible mixture of gases. How does this property of air affect the rate at which
air pressure decreases with increasing altitude? - correct answer Gravity causes the
maximum air density to be at Earth's surface. As altitude increases, the air
begins to thin rapidly, which is accompanied by a decline in air pressure.
How does a change in temperature affect air density? How does a change in humidity affect
,air density? - correct answer When air is heated, air density usually decreases.
When the concentration of water vapor
(humidity) increases, air density usually decreases as well.
Why does a cold, dry air mass exert a greater surface air pressure than an equally cold but
more humid air mass? - correct answer A cold dry air mass has a greater density
than a more humid air mass. This would mean that
the humid air mass has lower air pressure. This is because the molecular weight of water is less
than the molecular weight of dry air.
Why are air pressure readings adjusted to what they would be if the weather station were
actually located at sea level? - correct answer Pressure readings are adjusted to sea
level in order to observe changes in air pressure on a
horizontal plane. It helps scientists identify air masses and weather changes and helps aid in
weather forecasting.
Distinguish between Charles' law and Boyle's law. - correct answer Charles' law
defines the relationship between density and temperature in an ideal gas with
constant pressure. Boyle's law defines the relationship between pressure and density when
temperature is held constant. Together these two laws make the ideal gas law.
Why is the dry adiabatic lapse rate greater than the moist adiabatic lapse rate? - correct answer
Because of the release of latent heat accompanying phase changes of water vapor, a saturated
air parcel cools more slowly than an unsaturated air parcel. This causes the moist adiabatic lapse
rate to be lower.
Is there some altitude which clearly marks the top of the atmosphere? Explain your response. - correct
answer No one altitude can be defined as the top of the atmosphere because it
does not have a uniform
density. The top of the atmosphere varies by location.
, On televised weathercasts, air pressure is often reported in units of length (inches) rather than
units of pressure (millibars). Explain why. - correct answer Weathercasters typically
use inches of mercury rather than millibars because "at home"
barometers typically display in inches.
On a particularly warm and humid evening, a sportscaster comments that baseballs hit to the
outfield "will not carry far in this heavy air." How valid is the sportscaster's observation? - correct answer
Baseballs hit to the outfield actually should travel further through a hot, humid atmosphere.
Air becomes less dense with increasing temperature and increasing humidity and less dense air
offers less resistance to a batted ball.
If water is used in place of mercury in a class-tube barometer, what is the required height of
the tube? The density of mercury (Hg) is 13.6 g/cm3
and the density of water is 1.0 g/cm3
. - correct answer The glass tube for a mercury barometer is about 1 m in length. If
water is used instead of
mercury, the glass tube would have to be about 13.6 m in length because the density of mercury
is 13.6 times the density of water.
At Minneapolis, MN, the air pressure typically drops more rapidly with altitude on a cold day
in January than on a warm day in July. Explain the difference. - correct answer Air
pressure drops more rapidly with elevation in cold, dense air than in warmer, less dense
air.
The tropopause is higher over the tropics than over middle latitudes. Explain why. - correct answer
The air is warmer over the tropics than over the middle latitudes. Colder air is denser than
warmer air, causing the height of the tropopause to be higher over the tropics.
A jet aircraft is cruising at the 600-mb level, that is, at the altitude where the air pressure is
600 mb. What fraction of the atmosphere's mass is below the aircraft? - correct answer
Assume that the air pressure at sea level is 1000 mb. Then, 1000 mb − 600 mb = 400 mb.
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