notes 2-19 - that part of the atmospheric pressure...

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CHAPTER 4 – MOISTURE Water – exists in three phases Vapor (gas) Liquid Solid (ice) Energy is either absorbed or given off changing between phases Processes in which heat is absorbed by the substance and taken away from the environment Melting – solid changing to liquid Evaporation – liquid changing to vapor o Amt of vaporation is controlled by volume of air, temp, wind spd, cloud cover Sublimation – solid changing to vapor (no liquid phase) Processes by which energy is given up by the substance and added to the environment Condensation – vapor changing to liquid Freezing – liquid changing to solid Deposition – vapor changing to a liquid LATENT – means hidden, process used in formation of hurricanes Moisture variables Vapor pressure –
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Unformatted text preview: that part of the atmospheric pressure attributed to water vapor • Saturated vapor pressure – that part of the atmospheric pressure due to water vapor when the air is saturated at a specific temp • Mixing ratio – the actual amount of water vapor in a parcel of air – mass of water vapor per unit mass of dry air(grams of water/kilogram of air) • Saturated mixing ratio – the amount of water vapor in saturated air at a specific time • Relative humidity – the ratio of the amount of water vapor actually in the air compared to the max amt of water vapor required for saturation at that particular temp (and pressure) o Nothing more than a percentage o Too cold to snow (doesn’t exist)...
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