Exam 4: Atmospheric Humidity

When the dew point is determined with respect to a flat surface of ice, it is called the ice point.

Would lowering the temperature in your home during the winter cause the relative humidity to increase or decrease? Why?

The heat index (HI)is used by the National Weather Service and combines ____ with ____ to determine an apparent temperature.

Suppose it is snowing outside and the air is saturated. The air temperature and dew point are both 15 degrees Fahrenheit, and the actual vapor pressure is 3 mb. If this air is brought indoors and warmed to 75 degrees Fahrenheit, what would the relative humidity of this air be, assuming that its moisture content does not change? (The saturation vapor pressure at 75 degrees Fahrenheit is 30 mb.)

With the aid of a figure, illustrate and describe the circulation of water in the atmosphere (the hydrologic cycle).

Which of the following will increase the relative humidity in a home during the winter?

The ____________________ temperature is the temperature to which air would have to be cooled (with no change in air pressure or moisture content)for saturation to occur.

A sling psychrometer directly measures the relative humidity.

Describe how a sling psychrometer can be used to determine the relative humidity or dew point.

As the air temperature increases, the air's capacity for water vapor ____.

In terms of the air temperature and water vapor content, explain how the relative humidity normally changes during the course of a 24-hour day.

In summer across North America, ____ vapor pressures are experienced over the drier Great Basin, especially Nevada; in winter, ____ values exist over the northern Great Plains into Canada.

Why is the wet-bulb temperature a good measure of how cool human skin can become?

Condensation is most likely to happen when air ____ and the speed of the water vapor molecules ____.

An automated instrument that measures humidity, and consists of a flat plate coated with a film of carbon, is known as a(an)____.

The temperature difference between the dry bulb and the wet bulb is known as the ____.

When the air temperature is below freezing, the saturation vapor pressure over water is ____________________ than the saturation vapor pressure over ice.

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

Saturation vapor pressure primarily depends upon air temperature.

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.