WX 201 Exam 2 with correct Answers Graded
A+
At what time of day is the relative humidity normally at a minimum?
when the air temperature is highest
The time of day when the relative humidity reaches a maximum value is usually
at the time when the air temperature is lowest.
The instrument that measures humidity by measuring the amount of radiant energy absorbed by
water vapor is the
infrared hygrometer.
The relationship between the mass of water vapor in an air parcel and the mass of all air in the same
parcel (including vapor) is called ____.
specific humidity
The mass of water vapor in a given volume of air is called ____.
absolute humidity
The heat index (HI) is used by the National Weather Service, and combines ____ with ____ to
determine an apparent temperature.
air temperature; relative humidity
The lowest temperature that can be attained by evaporating water into the air is known as the
wet-bulb temperature.
Which of the following will increase the relative humidity in a home during the winter?
taking a shower and letting the air circulate through the home
The ratio of the mass of water vapor in a given volume (parcel) of air to the mass of the remaining dry
air describes the
mixing ratio.
____ law of partial pressure describes that the total pressure inside an air parcel is equal to the sum
of all pressures of the individual gases present in the air parcel.
Dalton's
On a warm and windy day evaporation will be ____.
High
The density of water vapor in a given parcel of air is represented by the
absolute humidity.
Which of the following is the BEST indicator of the actual amount of water vapor in the air?
, dew point temperature
This instrument uses wet-bulb and dry-bulb temperature to obtain relative humidity:
sling psychrometer
A high water vapor pressure indicates a(n)
relatively large number of water vapor molecules in the air.
As the difference between the air temperature and the dew point increases, the relative humidity
decreases.
Instruments that measure humidity are called
hygrometers
If the air temperature outside increased, with no addition or removal of water vapor, the actual vapor
pressure would
stay the same.
In the solid state called ice, the shape and charge of water molecule helps arrange the molecules into
____ crystals.
six-sided (hexagonal)
The hot, desert air of the Sahara often contains ____ water vapor than the cold, polar air farther
north, therefore has a ____ specific humidity.
more; higher
The temperature at which water boils depends mainly on
air pressure
The percentage of water vapor present in the air compared to that required for saturation is the
relative humidity.
If water vapor comprises 3.5 percent of an air parcel whose total pressure is 1000 mb, the water
vapor pressure would be
35 mb.
The temperature to which air must be cooled in order to become saturated is the
dew point temperature.
The percentage of water vapor present in the air compared to that required for saturation is the
relative humidity.
Instruments that measure humidity are called ____.
Hygrometers
A+
At what time of day is the relative humidity normally at a minimum?
when the air temperature is highest
The time of day when the relative humidity reaches a maximum value is usually
at the time when the air temperature is lowest.
The instrument that measures humidity by measuring the amount of radiant energy absorbed by
water vapor is the
infrared hygrometer.
The relationship between the mass of water vapor in an air parcel and the mass of all air in the same
parcel (including vapor) is called ____.
specific humidity
The mass of water vapor in a given volume of air is called ____.
absolute humidity
The heat index (HI) is used by the National Weather Service, and combines ____ with ____ to
determine an apparent temperature.
air temperature; relative humidity
The lowest temperature that can be attained by evaporating water into the air is known as the
wet-bulb temperature.
Which of the following will increase the relative humidity in a home during the winter?
taking a shower and letting the air circulate through the home
The ratio of the mass of water vapor in a given volume (parcel) of air to the mass of the remaining dry
air describes the
mixing ratio.
____ law of partial pressure describes that the total pressure inside an air parcel is equal to the sum
of all pressures of the individual gases present in the air parcel.
Dalton's
On a warm and windy day evaporation will be ____.
High
The density of water vapor in a given parcel of air is represented by the
absolute humidity.
Which of the following is the BEST indicator of the actual amount of water vapor in the air?
, dew point temperature
This instrument uses wet-bulb and dry-bulb temperature to obtain relative humidity:
sling psychrometer
A high water vapor pressure indicates a(n)
relatively large number of water vapor molecules in the air.
As the difference between the air temperature and the dew point increases, the relative humidity
decreases.
Instruments that measure humidity are called
hygrometers
If the air temperature outside increased, with no addition or removal of water vapor, the actual vapor
pressure would
stay the same.
In the solid state called ice, the shape and charge of water molecule helps arrange the molecules into
____ crystals.
six-sided (hexagonal)
The hot, desert air of the Sahara often contains ____ water vapor than the cold, polar air farther
north, therefore has a ____ specific humidity.
more; higher
The temperature at which water boils depends mainly on
air pressure
The percentage of water vapor present in the air compared to that required for saturation is the
relative humidity.
If water vapor comprises 3.5 percent of an air parcel whose total pressure is 1000 mb, the water
vapor pressure would be
35 mb.
The temperature to which air must be cooled in order to become saturated is the
dew point temperature.
The percentage of water vapor present in the air compared to that required for saturation is the
relative humidity.
Instruments that measure humidity are called ____.
Hygrometers
