JEG100H1 Chapter Notes - Chapter 7: Fluid Parcel, Ice Crystals, Hygrometer
1 Oct 2016
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Document Summary
Heat exchange from changes in physical state of water help power circulation of atmosphere. Deposition: water vapor attaches directly to ice crystal. Sublimation contributes to shrinking snow packs in dry, windy environments. Unusual density property allows ice to float and remain accessible at tops of oceans. Evaporation from stream or lake requires 585 calories. Latent heat of evaporation dominates cooling process in energy budget. Relative humidity: percentage of water vapor in air to maximum amount of water vapor possible. Further water vapor or decrease of temperature leads to condensation. Dew-point temperature: temperature at which air becomes saturated and net condensation forms water droplets. Frost point is temperature where air is saturated and ice forms on exposed surfaces. Inverse relationship between air temperature and relative humidity. Relative humidity highest at dawn, lowest in late afternoon. Vapor pressure: share of air pressure made up by water-vapor molecules. Hair hygrometer: measure change in length of a bundle of human hair.
