Meteorology Chapter 4

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Terms in this set (...)

absolute humidity
The density of water in a given volume of air
hair hygrometer
Measures relative humidity with human hairs
Heat Index
Combines air temperature with relative humidity to determine an apparent temperature
sling psychrometer
Uses wet-bulb and dry-bulb temperatures to obtain relative humidity
saturation vapor pressure
The maximum pressure that water vapor would exert if the air were saturated
infrared hygrometer
measures humidity by measuring the amount of infrared energy absorbed by water vapor
evaporative cooler
used to cool the air in hot, dry climates
specific humidity
the mass of water vapor in a given mass of air
air parcel
an invisible balloon-like body of air
the surface water temperature of the Gulf of Mexico is very warm
Which best explains why in North America the Gulf Coast states are more humid in summer than the coastal areas of southern California?
the air temperature and the dew point are fairly close together
Polar air is considered "dry" because the dew-point temperatures are often quite low. However, the relative humidity of this cold, polar air is usually high because:
increases
As the air temperature decreases, the likelihood of condensation occurring:
relative humidity
________ ________ can be described as the percent of water vapor in the air compared to that required for saturation
wet bulb
the lowest temperature that can be attained by evaporating water into the air is the _____ ______
dew point
the temperature to which air must be cooled for saturation to occur is called the ___ _____
lowest
on most days the relative humidity reaches its highest value when the air temperature reaches its _____ value
hydrolic
the circulation of water within the atmosphere is called the ________ cycle
evaporation
the process of water changing from a liquid to a vapor is called _______
hygrometers
instruments that measure humidity are called _______
increases
when the air temperature increases, the saturation vapor pressure
deposition
the process by which water changes from a vapor to a solid is called
dew-point temperature
which is the best indicator of the actual amount of water vapor in the air?
increase, increase
if the air temperature remains constant, evaporating water into the air will _______ the dew-point temperature and ________ the relative humidity
change in water vapor content and change in air temperature
List the two most important factors that cause the relative humidity of air to change