Atmospheric Moisture

Warm-Up Question: List some real-world examples of condensation. List some real-world examples of condensation. When the outside of a cold soda pop can gets wet because of condensation, When the outside of a cold soda pop can gets wet because of condensation, What is the liquid on the can?What is the liquid on the can? Where does the liquid come from?Where does the liquid come from?

Water vapor is the most important gas for understanding weather! Examples of water in the weather: Examples of water in the weather: RainRain SnowSnow SleetSleet HailHail FogFog CloudsClouds HumidityHumidity

Sublimation – solid (ice) turns to water vapor. Deposition – water vapor changes directly to ice.

Humidity Humidity – Amount of water vapor in the atmosphere. (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)

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

Psychrometer – instrument used to measure relative humidity.