1. Science Jolt Dec
In your journal, describe a time when you experienced or observed condensation.

2. Water in the Atmosphere

3. The Water Cycle
The movement of water between the atmosphere and the Earth

4. Evaporation
The process by which water molecules in liquid water escape into the air as water vapor.

5. Humidity
A measure of the amount of water vapor in the air.

6. Relative Humidity Measured with a psychrometer
The % of water vapor in the air compared to the maximum amount that the air can hold
Warm air holds more water vapor than cold air

7. psychrometer

8. Condensation
The process by which molecules of water vapor in the air become liquid water.

9. Dew Point
The temperature at which condensation begins is the dew point (RH = 100%)
When the dew point is below freezing, frost will form

10. Create a cloud….

11. Cloud Formation
Clouds form when warm humid air rises and cools to the dew point (rising air = ___Pressure)
The water vapor condenses on tiny particles (“cloud dust” - condensation nuclei) – Particles!

12. Types of Clouds
Three main Types…
Cumulus: puffy (cotton)
Stratus: blanket like (layer)
Cirrus: feathery/wispy (high)

13. Types of Clouds
Nimbus: producing rain
Alto: high in the atmosphere

22. Fog Clouds that form on the ground
Forms when there are cool temperatures after a warm humid day

24. What instrument is used to measure relative humidity?
What conditions are needed for clouds to form?
Describe each of the three main types of clouds.

25. SCIENCE BLOCK C and E combined Questions:
Name the clouds…show 4 clouds and match
Read relative humidity given a wet and dry bulb reading and using the chart
Describe how clouds form
Where do cirrus clouds form?
What is the instrument used to measure relative humidity?
Name the three main cloud types and their shapes
Identify air masses from a diagram showing their location
What is relative humidity and how is it measured?
When dew point is ___________ frost is formed
Describe how clouds and fog forms
Describe the four air masses
What do clouds need to form (warm rising air/condensation nuclei)
How do you determine the last name of an airmass?
How does pressure affect clouds? (if you increased pressure what would happen in a “cloud in a bottle” demo?