Chapter 27 Section I-II Moisture in the Atmosphere

Topics for Today Review – Water Cycle – Composition and Layers of the Atmosphere – Weather New Material – 27-I Humidity Humidity – Specific – Relative Measuring Humidity – Psychrometer – Hygrometers – 27-II Condensation Processes Condensation and Dew Point – Cooling – Saturation Point – Nuclei Fogs – Advective vs. Radiative

Water Cycle

The Atmosphere Temperature, Pressure and Moisture

Weather – Weather is the state of atmosphere at a given time and place – Weather is a combination of… current temperature humidity precipitation cloudiness visibility wind pressure

Humidity Specific Relative Figure 27.3 pg. 500

Humidity and Quality of Life

Measuring Humidity Psychrometer Other Hygrometers – Google images Google images – Horse Hair

Condensation Cooling to dew point Figure 27.5 pg 503 Condensation on… – surfaces – Nuclei

Condensation at Ground Level: Fog Advective Radiative

Summary Specific Humidity Relative Humidity Condensation Processes