Ch 18 and 19

If the water-vapor content of air remains constant, lowering air temperature causes what?
When the water-vapor content of air remains constant, lowering air temperatures causes an increase in relative humidity, and raising air temperature causes a decrease in relative humidity.
What is true about warm, saturated air?
Warm saturated air contains more water vapor than cold air.
Compared to clouds, fogs are?
Clouds result when air rises and cools. Fog is a cloud with its base at or near the ground.
Air that has reached its water vapor capacity is said to be?
Hurricanes form in tropical waters between the latitudes of what?
5 and 20 degrees north and south latitude.
What type of front forms when the surface position of the front does not move?
Stationary front.
The process of converting a liquid to a gas is known as?
The boundary that separates different air masses is called what?
What is the first sign of an approaching warm front?
The first sign is the appearance of cirrus clouds.
What kind of shape is associated with a middle-latitude cyclone?
Wave shape.
What is the dry adiabatic rate?
Rate of cooling or heating in unsaturated air.
A low cloud that blankets the sky and often generates precipitation is called an?
Which term is used to describe clouds of middle height?
The process by which water vapor changes directly into a solid is called?
An immense body of air characterized by similar properties at any given altitude is known as?
Air mass.
Which of the following refers to the temp to which air would have to be cooled to reach saturation?
Dew point.
Water Vapor makes up what fraction of atmospheric gases?
0 to 4 percent.
Which gas is the most important for understanding atmospheric processes?
Water vapor.
The ratio of air’s water vapor content to it capacity to hold water vapor at the same temperature is the?
Relative humidity.
Which of the following refers to the energy that is stored or released during a change of state of water?
Latent heat.