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Exam 4: Atmospheric Humidity

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Question 41

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

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An appropriate answer would be that the ...

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Question 42

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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.

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Question 43

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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 ____.​

What happens when air is saturated?​

The relative humidity is often near 100 percent in polar regions.

The mass of water vapor in a given volume of air is called ____.​

The lowest temperature that can be attained by evaporating water into the air is known as the​

An enterprising travel agent trying to sell you a summer vacation package to Phoenix, Arizona, claims that the summertime relative humidity is above 90 percent. Can this be true? Explain.

On a warm and windy day evaporation will be ____.​

A sling psychrometer directly measures the relative humidity.

The higher the temperature of a gas, the ____________________ its molecules move.

In order to reduce evaporation and conserve water, do you think it would be better to water a lawn in the early morning or early evening?

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.

The air's moisture content can be described by measuring the pressure exerted by the water vapor in the air.

A temperature of 90 degrees Fahrenheit and a relative humidity of 90 percent can occur only if the ____ is incredibly high, which is only very rarely observed in the United States.​

Frozen clothes "dry" outside in subfreezing weather by a process called ____________________.

Which of the following will increase in a rising parcel of air?​

If all of Earth's water vapor were to suddenly condense and fall as rain, it would be enough to cover the entire globe with ____ of water.​

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

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.