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Understanding Atmospheric Moisture and Water Properties

Explore the fascinating world of atmospheric moisture and water properties on Earth. Learn about the special characteristics of water, the process of evaporation, humidity measurements, dew point, condensation, lapse rates, adiabatic processes, and the stability of air. Discover how water vapor affects our planet's temperature and weather patterns.

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Understanding Atmospheric Moisture and Water Properties

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  1. Class 4a: Atmospheric moisture

  2. Introduction to water • Earth’s temperature  special properties of water

  3. Introduction to water • Energy needed to change state

  4. Evaporation • How does water evaporate?

  5. Evaporation • Water vapor stores latent heat • Vapor pressure: pressure exerted by water vapor

  6. Vapor pressure

  7. Evaporation • How quickly does water evaporate?

  8. Humidity • Absolute humidity: ratio of water vapor to a given volume of air • Specific humidity: ratio of water vapor to a given mass of air

  9. Humidity • Relative humidity: ratio of water vapor to maximum water vapor capacity

  10. Dew point • When air cools, water vapor capacity _____ and relative humidity _____

  11. Condensation • Condensation: water vapor becomes liquid, releases latent heat

  12. Lapse rates • Normal lapse rate: 3.5°F/1000 feet

  13. Adiabatic processes • Air changes temperature by convection, not conduction

  14. Adiabatic processes • If a rising parcel of air cools to its dewpoint, then ______ occurs

  15. Adiabatic processes

  16. Stability of air • Buoyancy: tendency of an object to rise

  17. Stability of air

  18. Stability of air • Stability: normal lapse rate of surrounding air is less than DALR

  19. Stability of air • Unstable air: normal lapse rate of surrounding air is greater than DALR

  20. Stability of air • Conditionally unstable air: stable up to a point

  21. Stability of air

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