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Presentation transcript:

Pick up worksheet from front table and glue into notebook. Objective: 02/22/2013 Describe how relative humidity is affected by temperature and levels of water vapor. Intro Pick up worksheet from front table and glue into notebook. Weekly WS #24: What is humidity?

Water in the Air

Water in the Air Humidity Amount of water vapor in the air

**Warm air holds more water than cold air**

Water in the Air Relative humidity The amount of water vapor that is in the air compared to the maximum amount of water vapor the air can hold at a certain temperature Expressed as a percentage

Water in the Air Factors Affecting Relative Humidity Example: Amount of water vapor Temperature More water vapor in air… … higher the relative humidity As temperature increases… …relative humidity decreases

Water in the Air Measuring Relative Humidity Psychrometer Consists of two thermometers Wet-bulb thermometer Dry-bulb thermometer Difference in temperature readings indicate amount of water vapor in the air

Water in the Air How a Wet-Bulb Thermometer Works Wet-bulb thermometer covered with a damp cloth If water evaporates quickly, relative humidity is low If water evaporates slowly, relative humidity is high

Difference

Water in the Air Dry Bulb Temp. – Wet Bulb Temp. = Difference # Match Dry Bulb Temp. & Difference # on Relative Humidity chart Where the two numbers meet is the relative humidity %

Dry-Bulb Temp = 40 Wet-Bulb Temp = 35 Difference? Relative Humidity? 61% Dry-Bulb Temp = 60 Wet-Bulb Temp = 56 Difference? 4 Relative Humidity? 78%

Water in the Air Condensation Dew Point Gas  liquid Can only happen when the air is saturated Relative humidity = 100% Temperature at which gases condenses into liquid

SUMMARY What is humidity? What tool measures relative humidity? Explain how a wet-bulb thermometer works. How is dew point related to condensation?

How much humidity would a desert have? (high or low) Explain. Objective: 2/22/2013 Describe how relative humidity is affected by temperature and levels of water vapor. Outro How much humidity would a desert have? (high or low) Explain.