The graph shows the relationships between air vapor pressure, air temperature, a
ID: 237095 • Letter: T
Question
The graph shows the relationships between air vapor pressure, air temperature, and relative humidity. Relative humidity on the graph is abbreviated ‘hr’ and shown as a proportion, rather than a percentage; a proportion of 1.0 equals 100% relative humidity, a proportion of 0.5 equals 50%.
What is the dew point temperature (degrees C) at an air temperature of 20oC and 2 kPa vapor pressure?
2.5 degrees C
7 degrees C
17.5 degrees C
21 degrees C
22.5 degrees C
a.2.5 degrees C
b.7 degrees C
c.17.5 degrees C
d.21 degrees C
e.22.5 degrees C
Explanation / Answer
Td = T - ((100 - RH)/5.)
where Td is dew point temperature (in degrees Celsius), T is observed temperature (in degrees Celsius), and RH is relative humidity (in percent).
From the graph, when T=20C, P=2kPa, RH = 0.88 = 88%
Putting this in formula,
Dew Temp = 20 - [(100-88)/5]
= 17.6 C
Nearest option is C
So our answer is (C) 17.5 degree C
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.