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Intro

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.

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Intro

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  1. 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?

  2. Water in the Air

  3. Water in the Air • Humidity • Amount of water vapor in the air

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

  5. 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

  6. 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

  7. 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

  8. 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

  9. Difference

  10. 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 %

  11. Dry-Bulb Temp = 40 • Wet-Bulb Temp = 35 • Difference? • 5 • Relative Humidity? • 61% • Dry-Bulb Temp = 60 • Wet-Bulb Temp = 56 • Difference? • 4 • Relative Humidity? • 78%

  12. 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

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

  14. 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.

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