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Atmospheric Moisture

Atmospheric Moisture. What is Atmospheric Moisture. Changing forms of water Energy absorbed and lost. Latent Energy. Sublimation – solid (ice) turns to water vapor. Ex: dry ice, add to clouds & make bigger (dry and cold) Deposition – water vapor changes directly to ice.

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Atmospheric Moisture

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  1. Atmospheric Moisture

  2. What is Atmospheric Moisture • Changing forms of water • Energy absorbed and lost Latent Energy

  3. Sublimation – solid (ice) turns to water vapor. Ex: dry ice, add to clouds & make bigger (dry and cold) Deposition– water vapor changes directly to ice. Ex: snow formation in clouds

  4. Humidity • Humidity – Amount of water vapor in the atmosphere. • Controlled by rates of condensation and evaporation • As the temperature of the air increases, the more water vapor the air can hold • Relative Humidity – ratio of the amount of water vapor in the air to the amount of water vapor it can hold. (saturated at equilibrium)

  5. Its hard to measure due to the changing/shifting of the air!!! Probably because of the temperature and pressure • Absolute Humidity • Mass or actual amount of water vapor in the air • Calculating Absolute Humidity Absolute humidity = mass of water vapor (grams) volume of air (cubic meters)

  6. Dew Point • Dew point – The temperature to which air must be cooled to reach saturation. Dew- moisture that forms at dew point Below 32º F, dew is froze = frost

  7. Measuring Humidity • Psychrometer – instrument used to measure relative humidity. • Try to better predict weather conditions • Consists of two thermometers • One damp and one dry • Absorption and Evaporation of Moister • Compare the temperature readings • Calculate Relative Humidity • If no difference then atmosphere is saturated

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