The graph shows the relationships between air vapor pressure, air temperature, a

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 at an air temperature (degrees C) of 40oC and 2 kPa vapor pressure?

2.5 degrees C

7 degrees C

17.5 degrees C

21 degrees C

22.5 degrees C

2.5 degrees C

7 degrees C

17.5 degrees C

21 degrees C

22.5 degrees C

Explanation / Answer

First let us find relative humidity,

Analysing the graph at T = 40C and P = 2kPa, the relative humidity is 0.2667

So RH = 26.67%

Dew Temp = T - ((100 - 26.67)/5)

where Td is dew point temperature (in degrees Celsius), T is observed temperature (in degrees Celsius), and RH is relative humidity (in percent).

Dew Temp = 40 - ((100 - 26.67)/5)

       =25

The closest option we have is 22.5

Since the graph was not precise, the exact answer may vary but just a little

Nearest option is e) 22.5 degree C iscorrect

Related Questions

Navigate

• Browse (All)
• Browse T
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.