1. Understanding Weather Water in the Air Ch. 2 Sec. 1 p. 38-44

2. The Water Cycle The water cycle is the continuous movement of ___________ from sources on _____________ _______________ into the ________, onto and over ___________, into the ________________, and back to the surface. This is a constant cycle. NO water is ever added or removed- it simply changes states (solid, liquid, gas) and location! Jefferson Lab: The Water Cycle

3. Humidity __________ _________ is water that has evaporated and become moisture in the air. The amount of water vapor in the air is called ______________ __ water vapor = __ humidity It is dependant on temp. If temp __, then the ability for the air to hold water (be humid) also __

4. Relative Humidity Relative humidity is the amount of water vapor in the ______ compared to the_____________ amount of water vapor ______ can hold. It is a ratio and is expressed as a percentage: actual H 2 O vapor content (g/m 3 ) saturation H 2 O vapor content (g/m 3 ) x 100 = relative humidity (%) When the air is ‘full’, it is holding all the water it can, it is called ______________________

5. What affects relative humidity? 1. amt. of H 2 O vapor: *Positive Correlation As H2O vapor in air __, relative humidity __ 2. temp.: * Negative Correlation As air gets warmer (temp.__ ), relative humidity __ As air cools (temp. __), relative humidity __ _______________________ is instrument that measures relative humidity

6. Condensation Condensation is when a ______ becomes a __________ (i.e. water vapor in air to water drops) *This is what happens to outside of a cup in the summertime! For this to happen, air must be ____________ (100% relative humidity) Condensation happens when saturated air _______

7. Dew Point 2 reasons air can become saturated: 1. 2. Dew Point- temp. at which a ______ turns to __________; air is ______________