Name:______

Chapter 23 Test Review

  1. You must know all of the vocabulary words on the back of this review sheet.
  1. Study the diagram on p. 575 (you also have this in your notes). You need to know what it is called to go between the various phases of water. (Freezing, melting, evaporation, condensation, sublimation, deposition). Which ones release heat? Which ones absorb heat?
  1. What form of water is in the air? What is the main source of this moisture?
  1. What is the difference between absolute humidity and relative humidity? What units are they expressed in?
  1. Explain 2 ways that humidity can be changed.
  1. How is humidity measured? Explain 2 ways.
  1. What is the dew point? What happens at temperatures below the dew point?
  1. Why are dew and frost NOT types of precipitation?
  1. What 2 things must happen for a cloud to form?
  1. How do most clouds form?
  1. What is a condensation level?
  1. Describe and draw a picture of the basic cloud types: stratus, cumulus and cirrus.
  1. What do the words alto and nimbo mean when in a cloud name?
  1. How does a cumulonimbus cloud form? What is the anvil? What type of weather does it bring?
  1. What is the difference between the 4 types of fog: radiation, advection, upslope and steam?
  1. Know the types of precipitation: rain, snow, sleet, hail, drizzle, glaze.
  1. Compare and contrast the 2 methods of precipitation formation: Coalescence and Supercooling
  1. What can be done to cause or increase the chances of precipitation?

Vocabulary – Match the words below with the description. Use each word only once.

Cirrus Clouds / Evaporation / Humidity / Saturation Temperature
Clouds / Fog / Precipitation / Sleet
Condensation / Frost / Rain / Sling Psychrometer
Cumulus Clouds / Hail / Rain Gauge / Snow
Dew / Relative Humidity / Stratus Clouds / Dew-Point Temp
Saturated Air / Water Vapor
  1. The name commonly used for water as a gas1.______
  2. The changing from a liquid to a gas2.______
  3. The changing from a vapor into a liquid3.______
  4. Air that contains all the moisture it can hold4.______
  5. The amount of moisture in the air5.______
  6. A comparison of the amount of moisture in the air to the amount it can hold6.______
  7. An instrument that measures humidity7.______
  8. The temperature at which air is saturated8.______
  9. Same as saturation temperature9.______
  10. Puffy clouds that look like large cotton balls10.______
  11. Wispy, feathery looking clouds11.______
  12. Any form of water that falls to the earth12.______
  13. Drops of liquid water that fall to the earth13.______
  14. Precipitation in the form of flakes14.______
  15. Small pellets of ice that form when rain drops fall through cold air and freeze15.______
  16. Droplets of water that condense on objects on the earth’s surface16.______
  17. Ice crystals that form on objects on the earth’s surface17.______
  18. A cloud that is formed on earth’s surface18.______
  19. Droplets of water that condense on tiny particles up in the sky19.______
  20. An instrument used to measure the amount of precipitation20.______

WET BULB / DRY BULB practice problems: (use the chart you were given) all numbers are in degrees Celsius

  1. What is the relative humidity if the dry-bulb temp is 18 and the wet bulb is 14. What is the relative humidity?
  1. What is the relative humidity if the dry bulb temp. is 24 and the difference between wet and dry bulbs is 10?
  1. What is the dry bulb temperature if the relative humidity is 37% and the difference between wet and dry bulb temps is 8?
  1. What is the difference between the wet bulb and the dry bulb temps if the relative humidity is 76% and the dry-bulb temp is 22?
  1. What is the relative humidity if the wet bulb temp and the dry bulb temp. are the same? Why?

CAPACITY CHART READING - use the chart you were given

  1. What is the maximum number of grams of water the air can hold at a.) 15 degrees C?

b.) 0 degrees C? c.) At 28 degrees C?

2. What temp is the air holding a.) 20 g/kg?b.) 10 g/kg?c.) 25 g/kg?

RELATIVE HUMIDITY CALCULATIONS – Show all work and units!!!

  1. If the temp. is 30 and the absolute humidity is 25 g/kg, what is the relative humidity?
  1. If the temp is 15 and the absolute humidity is 5 g/kg, what is the relative humidity?
  1. If air at 35 degrees C contains 30 g/kg of water vapor, what is the relative humidity?
  1. How much water vapor would have to be in the air when the temp was 35 degrees in order to have 100% humidity?
  1. Suppose the air in a room is 15 degrees and the relative humidity is 65 %. What is the absolute humidity?

6. If the air in the same room as #5 was cooled to 10 degrees, calculate the new relative humidity.

Essay Questions:

1. Why is there “fog” on the mirror after a hot shower?

2. How does a psychrometer work? Why is the wet bulb temperature lower than the dry bulb temperature? How does the rate of evaporation change with the amount of moisture in the air?

3. How does lake effect snow form?

4. Explain how the drinking bird works. Include the steps for one full cycle.

5. How did we get clouds to form in the bottle? Include the words temperature, pressure, dew point and condensation in your answer.

6. In the dew point lab, where did the water that condensed on the can come from? How is the dew point affected by the relative humidity of the room?