Liquid water gains heat and turns into water vapor.

 Water vapor loses heat and turns into liquid water.

 Water falling from the sky.

 The process of emitting water vapor through the leaves of plants.

Water in the atmosphere vapor clouds

 Measure of the amount of water vapor in the air.  Amount depends on the air temperature. Warm air can hold more water vapor.

 Percent of water vapor that is actually in the air compared to the maximum amount it can hold at a particular temperature.

 Sling Psychrometer

Example at 10 degrees Celsius 1 cubic meter of air can hold 8 grams of water vapor; if there were 8g of vapor in the air then the relative humidity would be 100%. What would the relative humidity be if the same cubic meter of air had 4 g of water vapor? 50 %

 Relative humidity is 25%, how many grams of water? 2 g

 What happens if the temperature of the air increases? Warm air can hold more water

 Why might condensation occur if air is cooled enough?  The amount of water in the air would become greater than the air could hold.

 The temperature at which condensation begins. Must have surface to condense on.  Dew point below 0 degrees C  Frost

 Tiny particles in the atmosphere provide surface for water vapor to condensate on. Dust Salt Smoke

 Stratus- flat layered clouds, spread out usually cover the sky. Low level clouds.

 Fluffy rounded piles of cotton. Low level clouds.

 Wispy, feathery clouds. High level clouds.

 Alto- high Altostratus Altocumulus  Nimbo/Nimbus- rain Nimbostratus Cumulonimbus

 Rain.  Sleet- as rain falls through air that is below 0 C it freezes.  Freezing rain- rain freezes as it hits cold surface.  Snow- vapor converted directly to ice crystals.  Hail- ice pellets, updrafts push it back into the cumulonimbus cloud where it grows.

 Silver oxide  Dry ice