EAPS CHAPTERS 5-8 ACTUAL EXAM
QUESTIONS WITH VERIFIED ANSWERS
Air pressure at sea
level is approximately 14.7 pounds per square inch or approximately _____ kilograms per
square
centimeter.
1
Air pressure is reported in a variety of units. The air pressure unit most commonly
reported to
the public is based on the height of a column of mercury which exerts at its base the same
pressure as the atmosphere at that place. This pressure measurement technique is adequate
for
many purposes because the height of the mercury column is directly proportional to air
pressure.
The average (standard) sea-level atmospheric pressure is ______ inches of mercury. This is
equivalent to 76 cm or 760 mm of mercury.
29.92
In the United States, meteorologists currently use the millibar (mb) unit as the standard
unit of
air pressure (equal to a hectoPascal). Standard sea-level air pressure is _____ mb.
1013.25
Because air pressure is determined by the weight of the overlying air, knowing air pressure
values at sea level and at different altitudes makes it possible to determine the amount of
atmosphere (by mass) that is above and below a particular altitude. For example, average
sealevel
air pressure is approximately 1000 mb. At the altitude where the pressure is 500 mb, half of
the mass of an atmospheric column would be below and half above. From the Standard
Atmosphere Table, this occurs at an average altitude of about _____ km above sea level.
5.5
According to the Standard Atmosphere, on average 25% of the atmosphere's mass (25% of
pressure) is found above an altitude of approximately _____ km., or, stating it another way,
75%
of the atmosphere's mass is found below that altitude.
10
A pressure-sensitive altimeter used in aircraft to measure altitude is a(n) _____ barometer.
, aneroid
To compare air pressures from place to place on the Earth's surface, a reduction-to-sea-
level
adjustment is made. Consequently, on a surface weather map the assumption is made that
for
purposes of pressure analysis all stations are located at an altitude of _____ m above sea
level.
0
By employing this sea-level correction, surface weather maps are thus constant _____
maps.
altitude
With an increase in altitude, air pressure decreases _____ rapidly in cold air than in warm
air.
more
Water vapor molecules have less mass than air "molecules". As a result, surface air
pressure
in a humid air mass would be _____ than that in a dry air mass if their temperatures and
other
characteristics are the same.
lower
Avogadro's Law states that equal volumes of gases (or gas mixtures) measured under the
same conditions of temperature and pressure contain _____ number of molecules.
equal
Surface air pressure will _____ in regions where less air converges at the surface than
ascends
fall
The ideal gas law is a relationship between
density, pressure, and temp
When a volume of gas expands due to decreasing surrounding pressure, the volume
undergoes
expansional cooling
Ascending, unsaturated air _____ at the rate of 9.8 degrees Celsius per
1000 m.
QUESTIONS WITH VERIFIED ANSWERS
Air pressure at sea
level is approximately 14.7 pounds per square inch or approximately _____ kilograms per
square
centimeter.
1
Air pressure is reported in a variety of units. The air pressure unit most commonly
reported to
the public is based on the height of a column of mercury which exerts at its base the same
pressure as the atmosphere at that place. This pressure measurement technique is adequate
for
many purposes because the height of the mercury column is directly proportional to air
pressure.
The average (standard) sea-level atmospheric pressure is ______ inches of mercury. This is
equivalent to 76 cm or 760 mm of mercury.
29.92
In the United States, meteorologists currently use the millibar (mb) unit as the standard
unit of
air pressure (equal to a hectoPascal). Standard sea-level air pressure is _____ mb.
1013.25
Because air pressure is determined by the weight of the overlying air, knowing air pressure
values at sea level and at different altitudes makes it possible to determine the amount of
atmosphere (by mass) that is above and below a particular altitude. For example, average
sealevel
air pressure is approximately 1000 mb. At the altitude where the pressure is 500 mb, half of
the mass of an atmospheric column would be below and half above. From the Standard
Atmosphere Table, this occurs at an average altitude of about _____ km above sea level.
5.5
According to the Standard Atmosphere, on average 25% of the atmosphere's mass (25% of
pressure) is found above an altitude of approximately _____ km., or, stating it another way,
75%
of the atmosphere's mass is found below that altitude.
10
A pressure-sensitive altimeter used in aircraft to measure altitude is a(n) _____ barometer.
, aneroid
To compare air pressures from place to place on the Earth's surface, a reduction-to-sea-
level
adjustment is made. Consequently, on a surface weather map the assumption is made that
for
purposes of pressure analysis all stations are located at an altitude of _____ m above sea
level.
0
By employing this sea-level correction, surface weather maps are thus constant _____
maps.
altitude
With an increase in altitude, air pressure decreases _____ rapidly in cold air than in warm
air.
more
Water vapor molecules have less mass than air "molecules". As a result, surface air
pressure
in a humid air mass would be _____ than that in a dry air mass if their temperatures and
other
characteristics are the same.
lower
Avogadro's Law states that equal volumes of gases (or gas mixtures) measured under the
same conditions of temperature and pressure contain _____ number of molecules.
equal
Surface air pressure will _____ in regions where less air converges at the surface than
ascends
fall
The ideal gas law is a relationship between
density, pressure, and temp
When a volume of gas expands due to decreasing surrounding pressure, the volume
undergoes
expansional cooling
Ascending, unsaturated air _____ at the rate of 9.8 degrees Celsius per
1000 m.
