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Dew Point and Relative Humidity. What is Humidity? Humidity- the amount of water vapor (WV) in the air Relative Humidity- the % of WV in the air compared.

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Presentation on theme: "Dew Point and Relative Humidity. What is Humidity? Humidity- the amount of water vapor (WV) in the air Relative Humidity- the % of WV in the air compared."— Presentation transcript:

1 Dew Point and Relative Humidity

2 What is Humidity? Humidity- the amount of water vapor (WV) in the air Relative Humidity- the % of WV in the air compared to the maximum amount of WV the air can hold at a certain temp.

3 Weather.com http://www.weather.com/weather/today/Livin gston+NJ+07039

4 True or False? WARM air can hold more water vapor than COLD air. TRUE! Warmer air is less dense, and therefore, has more room for water molecules

5 WARM AIR COLD AIR Larger volume, more room for H 2 O Smaller volume, less room for H 2 O

6 Calculating relative humidity: If 1 cubic meter of air at 60°F can hold 8 grams of water vapor and it currently holds 6 grams, what is the relative humidity of the air? 6 g ÷ 8 g = 0.75 = 75% rel. humidity

7 How is relative humidity measured? Relative humidity is measured with an instrument called a psychrometer

8 What is saturation? Saturation- The point at which air is “full” of water vapor R.H. = 100% Water vapor condenses

9 What happens when the air is saturated? DEW POINT - the temperature at which the air is saturated and condensation begins. –I–If DP is above freezing: liquid water (dew) –I–If DP is below freezing: solid water (frost)

10 Dew = air reaching condensation point ABOVE freezing http://apollo.lsc.vsc.edu/classes/idm3020/tut_folder/nick_tutorial/Images/grass-dew.jpg

11 Frost- air reaches condensation point BELOW freezing http://www.donnan.com/images/frost2.jpg

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