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Relative Humidity Worksheet

Name: ____________________________

Temp.

Water vapor (g)

-40

0.1

-30

0.3

-20

0.8

-10

2.0

0

3.5

5

5.0

10

7.0

15

10

20

14

25

20

30

26.5

35

35

40

47
Relative Humidity Problems


  1. If you discover that there is 10 g of water vapor in the air, and the air’s saturation point happens to be 25 g, what is the relative humidity of the air? Please show your work.





  1. What will the relative humidity of the air in Example 1 if the saturation point

    1. Drops to 20 g?





    1. Rises to 30 g?





  1. What is the relative humidity of air which is at dew point? How do you know this?






  1. There is 16 g water vapor in the air, which is at a temperature of 30 degrees C.

    1. What is the relative humidity of the air?





    1. What would the RH be if the temperature dropped to 20 degrees C?






    1. What would the RH be if the temperature increased to 35 degrees C?






  1. It’s raining, and the air temperature is 15 degrees C. About how much water vapor is present in the air, in g?





  1. The air has 20 g of water vapor in it. The thermometer outside your window says the air temperature is 40 degree C. If the amount of water vapor in the air does NOT change, how will the air temperature need to change in order for it to start raining? How do you know?






  1. How many g of water vapor can be in the air

    1. When the air temperature is 0 degrees C?



    1. When the air temperature is 30 degrees C?




  1. You got your very own sling psychrometer for your birthday from Aunt Sue! Your very first measurements are:

dry bulb temp = 30 degrees C

wet bulb temp = 22 degrees C

    1. What’s the relative humidity of that air? (use your chart from the lab)




    1. How would the relative humidity of the air change if the air temperature were to drop to 20 degrees C?




  1. Your wet bulb depression is 6 degrees C and the relative humidity of the air you are measuring is 60%.

    1. What is the air temperature (also known as the “dry bulb” temperature)?




    1. The air temperature increases by 5 degrees. What is the approximate relative humidity now?





    1. What would the relative humidity be, if instead of increasing by 5 degrees as in b, the temperature instead DECREASED by 5 degrees?



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Tags: vapor (g), water vapor, vapor, water