GEOG 214 Lecture Notes - Lecture 3: Mixing Ratio, Vapor Pressure, Dew Point Depression

30 views30 pages

Document Summary

Water vapour occupies <4% of the atmosphere, but has physical and biological significance e. g. , because it: is a major greenhouse" gas (i. e. it absorbs and emits. Ir: changes phase involving large amounts of latent heat, forms clouds that are radiatively significant (reflection solar, absorption ir) and they precipitate. Significance of atmospheric humidity: is a control/driving force on the rate of evaporation and transpiration, relevant to human and animal comfort (espec. Rh: relevant to incubation or persistence of several plant diseases (again rh, relevant to drying out of fire fuels (again rh, relevant to corrosion of materials. Water vapour content is often expressed in terms of either: (1) vapour density ( v), the mass of water per unit volume of air. [units: kg m-3 or commonly g m-3] or (2) vapour pressure (e), the partial pressure exerted by the vapour molecules [units: pa or kpa] remember pa= kgs-2m-1. The two are related by the ideal gas law: v e.

Get access

Grade+20% off
$8 USD/m$10 USD/m
Billed $96 USD annually
Grade+
Homework Help
Study Guides
Textbook Solutions
Class Notes
Textbook Notes
Booster Class
40 Verified Answers
Class+
$8 USD/m
Billed $96 USD annually
Class+
Homework Help
Study Guides
Textbook Solutions
Class Notes
Textbook Notes
Booster Class
30 Verified Answers

Related Documents