Chapters 23 and 24 Review By Sarah Snoberger

Chapter 23 - Atmospheric Moisture

Humidity -The amount of water vapor in the air Determined by the temperature or the air the temperature, the the rate of evaporation Absolute Humidity : absolute humidity = Relative Humidity: a common way to express the amount of water vapor in the atmosphere Psychometer- tool used to measure relative humidity Mass of air vapor ( grams) Volume of the air (cubic meters)

Cloud Formation - collections of small water droplets or ice crystals that fall slowly through the air: water vapor condensed and forms into clouds Mixing: two bodies of moist air masses mix together and causes the temperature to change Lifting: the air rises and causes clouds to form due to the temperature drop Advective Cooling: the temperature of the air mass decreases as the air moves over a cold surface

Types of Clouds

Types of Precipitation Rain: liquid precipitation Drizzle: the raindrops are smaller than 0.5 mm Snow: most common type of solid precipitation Sleet: when rain falls through cool air mass and comes out as clear ice pellets Hail: solid precipitation in the form of ice chunks

Chapter 24- Weather

Air Masses - a large body or air throughout which temperature and moisture content are similar Air Masses Source RegionType of AirSymbol Continentaldryc MaritimeMoistm TropicalWarmT PolarColdp

Types of Fronts Cold Front: the front edge of a moving mass of cold air that pushes beneath a warmer air mass like a wedge Warm Fronts: the front edge of advancing warm air mass that replaces colder air with warmer air Stationary Front: a front of air masses that moves either very slowly or not at all Occluded Front: forms when a cold air mass overtakes a warm air mass and lifts the warm air mass off the ground and over another air mass

Cyclones Midlatitude Cyclone: an area of low pressure that is characterized by rotating wind that moves toward the rising air of the central low-pressure region Anticyclone: the air sinks and flows outward from the center of high pressure

Reading a Weather Map Uses numerous letters, numbers, and symbols L = low pressure H= high pressure