ch 6 and on GEOG 2050

ch 6 and on GEOG 2050 - TEST THREE-WATER About 70 percent...

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TEST THREE---WATER About 70 percent of the earth is water; most of it is in its liquid form in the ocean. In atmosphere, exists in all three states in the atmosphere, liquid, gas, and solid. Evaporation-liquid to gas, can happen any time you have an input of energy, the more evaporation the more gas molecules you will get. Condensation- return of some of gas molecules, coming out of the air and condensing into liquid form The balance between evaporation and condensation is called saturation, when there is the same amount of both. Usually a relative percentage If you have a saturated atmosphere and you add more water through evaporation, then you have to have some type of cloud or condensation to balance it out How do we know if the air is saturated? How close to saturation? Dew Point Temperature- The hypothetical temperature of the air at which you would get saturation---the closer the temperature is to the dew point temperature the more moisture there is in the air. The higher the dew point temperature is the more moisture. The temperature in the air is always equal to or greater than the dew point Vapor pressure-pressure exerted by water molecules. The warmer the air is the more evaporation and as a result the vapor pressure would be higher. (Exponential relationship) “Warm air holds more water” better way to say this warm air promotes more evaporation. Saturation Vapor Pressure- the maximum possible water vapor in an atmosphere. Higher in warm air mass than it is cold air mass Humidity- amount of moisture in the air Absolute humidity-specific density of water vapor, mass of water divided by volume of room Specific humidity- the mass of water vapor divided by the mass of all the air molecules, theoretical concept, but can be calculated, useful for comparing humidity at different locations Relative humidity- amount of water vapor divided by the maximum possible water vapor, based on temperature, as temperature goes up, the relative humidity goes down. Warmest time of day typically has the lowest relative humidity, the coldest time of day has the highest relative humidity. If the relative humidity equals 100 percent means there is saturated air, may result in fog, dew, or rain. -Hair Hygrometer-measures humidity -Sling psychomotor- two thermometers, one with a cotton cloth wick, wet the wick, sling around, water starts to evaporate, the temperature starts to drop, compare the temperature Why do we care about saturation? Saturated-active condensation, which forms clouds (high or low) How does air become saturated? 1- Add more water vapor and keep temperature constant
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2- Mix cold air with warm moist air, like a warm drink on ice, they mix eventually becoming the same temperature, boom, clouds San Fran is known for their mixing and fog. Location dependant 3- Cool the air down until it reaches the dew point with no moisture exchange and no mixing Energy exchange ---Diabatic process Vs No energy exchange---Adiabatic process Diabatic- direct energy exchange
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ch 6 and on GEOG 2050 - TEST THREE-WATER About 70 percent...

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