Water Vapor & HumidityWater Vapor & Humidity Vocabulary/NotesVocabulary/Notes

pgs. D36-D39pgs. D36-D39

Chapter 10 Lesson 4Chapter 10 Lesson 4

1. water vapor1. water vapor

• water in the form of a gaswater in the form of a gas

• water vapor is in the airwater vapor is in the air

• it is invisible, colorless, odorless, & it is invisible, colorless, odorless, & tastelesstasteless

2. humidity2. humidity

• the the amountamount of water vapor in the air of water vapor in the air

• How does water get into the air?How does water get into the air?

3. evaporation3. evaporation

• changing of a liquid into a gaschanging of a liquid into a gas

• this process takes lots of energythis process takes lots of energy

• main energy source is the main energy source is the sunsun

4. condensation4. condensation

• changing of a gas into a liquidchanging of a gas into a liquid

• condensation is on… condensation is on…

shower doors shower doors

cold drink glassescold drink glasses

dew on grassdew on grass

5. relative humidity5. relative humidity• comparison between how much water comparison between how much water

vapor is in the air and how much the vapor is in the air and how much the air can holdair can hold

• What do you think happens when What do you think happens when the air reaches 100% humidity?the air reaches 100% humidity?

It rains.It rains. ex. As the temperature changes, the amount of moisture in the air ex. As the temperature changes, the amount of moisture in the air

also changes. Warmer air has more moisture and there is less water also changes. Warmer air has more moisture and there is less water vapor when it is cold. Imagine that Seattle and Boston have the vapor when it is cold. Imagine that Seattle and Boston have the same humidity level of 75%. If Seattle has a temperature of 65°F, same humidity level of 75%. If Seattle has a temperature of 65°F, while Boston has a temperature of 95°F, the amount of water in the while Boston has a temperature of 95°F, the amount of water in the air will be greater in Boston than in Seattle. Even though both cities air will be greater in Boston than in Seattle. Even though both cities have the same humidity level, there would be more moisture in the have the same humidity level, there would be more moisture in the air in Boston.air in Boston.

6. precipitation6. precipitation

• any form of water particles that falls any form of water particles that falls from the atmosphere and reaches from the atmosphere and reaches the groundthe ground (pg. D46)(pg. D46)

7. Reading a thermometer7. Reading a thermometer• What are the temperatures on these What are the temperatures on these

thermometers?thermometers?• Pay attention to how many degrees are Pay attention to how many degrees are

between each line.between each line.

*Give students thermometers to glue on page*

What are the temperatures on What are the temperatures on these thermometers?these thermometers?

• 72* F72* F

• 22* C22* C

*Give students thermometers to glue on page*

• 100* F100* F

• 37* C37* C