Transcript 24.4 Water in the Atmosphere Humidity

24.4 Water in the
Atmosphere
Humidity
• Amount of water vapor in the
air
Relative Humidity –
ratio of amount of water
vapor to max. water vapor
possible at that temperature.
Dew Point
•Temp. when air is
saturated with
water.(temp. when
dew forms)
Condensation
•Dew-on earth
•Clouds or fog-in air
Gas  liquid
(Deposition - Gas  solid
 Frost)
Clouds
• Dense, visible mass of tiny
water droplets or ice crystals
• Form as warm, moist air
rises and water vapor
condenses in the
atmosphere (on dust or salt)
Types of Clouds
• Stratus – flat, cover most of the
sky
• Cumulus – Puffy, white, cotton
balls. Fair weather
• Cirrus – Thin, wispy, high
mostly ice crystals. Often blow in
Ahead of rain clouds
Nimbo-,
-Nimbus
•When added to front
or end of a cloud
name, it means that
the cloud produces
precipitation.
Precipitation
•Rain
•Snow
•Hail
•Sleet
•Freezing Rain