meteorology

Condensation differs from precipitation, because during precipitation water vapor is removed fro the atmosphere, whereas during condensation solid or liquid water is removed from the atmosphere. True or False

false

Condensation occurs primarily when air is cooled, because as temp drops the speed of the water molecules increases. True or False

false

When the air temp. increases, the saturation vapor pressure decreases. True or False

false

In the United States, the lowest dew point, and hence the driest air, is found in the southwest, with the lowest values found in Arizona. True or False

False

As the difference between the air temperature and the dew point increases, the relative humidity: A. increases B. decreases C. remains constant at a value less than 100 percent D. remains constant and equal to 100 percent E. drops to zero

B. decreases

The temperature to which air must be cooled to become saturated is the . A. minimum temp B. dew point temp C. wet bulb temp D. freezing point E. maximum temp

B. dew point temp.

Which of the following will increase in a rising parcel of air? A. saturation vapor pressure B. relative humidity C. air temperature D. air pressure

B. relative humidity

What happens when air is saturated? A. The air temp. is equal to the dew point temperature. B. The relative humidity is nonetheless less than 100 percent. C. An increase in temp will cause condensation to occur. D. The temp. increases.

A. The air temp. is equal to the dew point temperature.

The density of water vapor in a given parcel of air is represented by the . A. absolute humidity B. relative humidity C. mixing ratio D. specific humidity E. saturation vapor pressure.

A. absolute humidity

If the air temperature remains constant, evaporating water into the air will ____ the dew point and ____ the relative humidity. A. increase; increase B. increase; decrease C. decrease; increase D. decrease; decrease E. not change; not change

A. increase; increase

As the air temperature increases, the air's capacity for water vapor . A. increases B. decreases. C. remains constant D. is unrelated to air temperature and can either increase or decrease E. drops by 50 percent.

A. increases.

Suppose the dew point of not inside air is the same as the dew point of the air indoors. If the door is opened and hot air replaces some of the cool air, then the new relative humidity indoors would be . A. lower than before B. higher than before C. the same as before D. impossible to tell from the info. given E. zero

A. lower than before

A high water vapor pressure indicates a (n) A. relatively large number of water vapor molecules in the air. B. relatively small number of water vapor molecules in the air. C. abundant supply of condensation nuclei in the air. D. relatively high rate of precipitation.

A. relatively large number of water vapor molecules in the air.

Suppose it is snowing outside and the air is saturated. The air temp and dew point are both 15 degrees Farenheit, and the actual vapor pressure is 3mb . If this air is brought indoors and warmed to 75 degrees Farenheit, what would the relative humidity of this air be, assuming that its moisture content does not change? A. 5 percent B. 10 percent C. 30 percent D. 50 percent E. 100 percent

B. 10 percent

If water vapor constitutes 3.5 percent of an air parcel whose total pressure is 1,000 mb, the water vapor pressure would be . A. 1,035mb B. 35 mb C. 350 mb D. 965 mb E. 3,500 mb

B. 35 mb

What will occur if a glass of water at a stable temp is surrounded by saturated air? A. The level of the water in the glass would slowly decrease. B. The waters temp would slowly increase. C. The level of the water in the glass would not change. D. The water's temp would slowly decrease. E. The level of the water in the glass would slowly increase.

C. The level of the water in the glass would not change.

The time of day when the relative humidity reaches a maximum value is usually: A. at the time when the air temp is highest B. in the middle of the afternoon C. at the time when the air temp is lowest D. just before sunrise E. about midnight

C. at the time when the air temp is lowest

If the air temp increased, with no addition or removal of water vapor the actual vapor pressure would . A. increase B. decrease C. stay the same D. become greater than the saturation vapor pressure E. become less than the saturation vapor pressure

C. stay the same

The percentage of water vapor present in the air compared to that required for saturation is the . A.mixing ratio B. absolute humidity C. dew point D. relative humidity E. specific humidity

D. relative humidity

Which of the following will increase the relative humidity in a home during the winter? A. Increasing the thermostat setting. B. Increasing the temp. of the air inside the home C. sealing the house against drafts D. taking a shower and letting the air circulate through the home E. turning on the ovenD.

D. taking a shower and letting the air circulate through the home

The of air parcel remain constant as long as water vapor is not added to or removed from the parcel. A. specific humidity B. relative humidity C. dew point D. water vapor content

D. water vapor content

A region can have a high specific humidity and low relative because large amounts of water vapor in the air and very high air temp. will cause the specific humidity to be high, but the relative humidity to be low. True or False

True

If the amount of water vapor in a descending atmospheric air parcel remains constant, the specific humidity also remains constant. True or False

true

Plants give up moisture by a process called transpiration. True or False

true

Saturation is more likely to occur in cool air than in warm air. True or False

true

Saturation vapor pressure primarily depends upon air temperature. True or False

true

The air moisture content can be described by measuring the pressure exerted by the water vapor in the air. True or False

true

The specific humidity and mixing ratio of an air parcel remain constant as long as water vapor is not added to or removed from the parcel. True or False

true

Under saturated conditions, for every molecules that evaporates, one must condense, and no net loss of liquid or vapor molecules results. true or false.

true

Water in a glass will evaporate more quickly on a windy, warm, dry summer day than on a calm, cold, dry winter day. True or False

true

comparing the three phases of water, molecules in the solid phase have the slowest vibrational speed, and molecules in the gaseous phase have the highest vibrational speeds. True or False

true