Name: _________________________________________________________ Date: _________________
Block: _____WKST #
Finding the Relative Humidity and Dewpoint Temperature Practice # 1
DEW POINT CHART: PAGE 12
Directions: using the DEW POINT chart on page 12 find the dew point temperatures for the following
examples:
Analysis Questions:
1. Dry Bulb = 120C
1. Is the dry bulb (air temperature) or the wet bulb
Wet Bulb = 80C
Difference = ____________
temperature always lower?
Dew Point = __________
________________________
2. Which station is it most likely to precipitate at soon?
2. Air Temperature = 260C
Wet Bulb = 200C
(1, 2, 3 4, 5 or 6) ___________
a. Why?
Difference = ____________
____________________________________
Dew Point = __________
_____
____________________________________
3. Dry Bulb = -100C
___________
Wet Bulb = -80C
Difference = ____________
Dew Point = __________
Challenge:
1. Dry Bulb = _________
0
4. Air Temperature = 15 C
0
Wet Bulb = 10 C
Difference = 70C
Dew Point = -50C
Difference = ____________
Dew Point = __________
5. Dry Bulb = 70C
Wet Bulb = 60C
Difference = ____________
Dew Point = __________
6. Air Temperature = 300C
Wet Bulb = 300C
Difference = ____________
Dew Point = __________
2. Dry Bulb = 100C
Wet Bulb = ___________
Dew Point = 40C
RELATIVE HUMIDITY CHART: PAGE 12
Directions: using the RELATIVE HUMIDITY chart on page 12 find the relative humidities for the
following examples:
1. Dry Bulb = 120C
Wet Bulb = 80C
Analysis Questions:
1. What is the relative humidity when the difference for
Difference = ____________
any dry bulb and wet bulb temperature is 0?
RH = __________
________________________
2. Which station is it most likely to precipitate at soon?
2. Air Temperature = 260C
0
Wet Bulb = 20 C
(1, 2, 3 4, 5 or 6) ___________
a. Why?
Difference = ____________
____________________________________
RH = __________
_____
____________________________________
3. Dry Bulb = -100C
Wet Bulb = -80C
___________
Difference = ____________
RH = __________
Challenge:
1. Dry Bulb = 200C
4. Air Temperature = 150C
RH = 58%
0
Wet Bulb = 10 C
Dew Point = _____________
Difference = ____________
RH = __________
5. Dry Bulb = 70C
Wet Bulb = 60C
2. Dry Bulb = 260C
Dew Point = 60C
RH = ___________
Difference = ____________
RH = __________
6. Air Temperature = 300C
Wet Bulb = 300C
Difference = ____________
RH = __________
Psychrometers: for each of the psychrometers, find the dew point and relative humidity.
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Dew Point = ______________ RH =
_____________
Dew Point = ______________ RH =
_____________
Dew Point = ______________ RH =
_____________