The property which primarily controls how much water can be present as a gas is
temperature of the air.
During a clear, relatively calm day, the relative humidity will tend to _______ from sunrise to early afternoon.
Evaporation is a process which tends to keep temperatures cooler where it occurs. This is because evaporation
uses energy to change the phase of water instead of warming it.
The heat released when water vapor condenses to form a cloud or when liquid droplets freeze in a cloud
helps the cloud to rise higher.
The most common reason why dew forms on the grass at night is that
temperatures are coolest in the grass.
A convergence of winds near the surface is associated with cloud production because it
forces the air to rise
If the air temperature remains constant, evaporation water into the air will ______ the dew point and _______ the relative humidity.
The two changes of state that are the most important part of the water cycle for the atmosphere would be
As the temperature of air is reduced to its dew point, which of these is most likely to occur?
When the dry and wet bulb temperatures measured by a psychrometer are equal, all but one of the following is true. Which one is false?
A rise in temperature would cause condensation
If air at sea level with a temperature of 27 degrees C is forced up a mountain slope and the air's dew point at the condensation level is 14 degrees C, at what elevation will condensation begin?
The moist adiabatic rate is different from the dry adiabatic rate because:
tent heat is released inside a parcel of rising saturated air.
If your environmental lapse rate is 7 C/km on a partly cloudy afternoon, then the atmosphere is said to be:
If your environmental lapse rate is 17 C/km on a partly cloudy afternoon, then the atmosphere is said to be
An inversion represents an extremely stable atmosphere because a parcel of air that rises into an inversion will become _____ and _____ dense than the air surrounding it.
These two conditions, working together, will make the atmosphere the most unstable.
warm the surface and cool the air aloft
The lapse rate of an air layer next to the ground is strongly influenced by
heating or cooling of the ground.
During the process of adiabatic cooling, the temperature decreases because the air has
expanded to a larger volume.
The stability of the air layer close to the earth's surface can vary markedly. Much of this variation is caused by
Changes in heating or cooling of the surface
A cold air mass that is warmed at its base from contact with the warm ground will have its lapse rate
You are flying in an airplane at 36,000 feet above sea level. You see lightning outside your plane window. The cloud that is close by is
The necessary conditions for hail formation include strong upward vertical motion and
large numbers of supercooled droplets.
Why do clouds represent a source of heat for the atmosphere?
Cloud formation releases latent heat to the air.
the important difference between liquid droplets and ice crystals in a supercooled cloud is that ice crystals
grow much more rapidly
The conditions that persist along the West Coast of the U. S. that are conducive to fog formation are
moist air moving over a cold surface.
The water content or volume of a raindrop is approximately ____ times that of a typical
Which of these clouds is least likely to produce precipitation that reaches the ground?
The most important process for cloud formation in the atmosphere is
cooling by expansion of the air.
Clouds, dew and frost all form because air has become saturated. This condition of saturation
is usually caused by
the air being cooled.