The graph shows the relationships between air vapor pressure, air temperature, a
ID: 237093 • 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%.
Air at the base of a mountain range is at 40oC and 40% relative humidity. Winds force this air up the side of a mountain range. The air cools as it is forced higher. If the air cools to __ oC (or lower) it will become saturated, resulting in condensation and likely precipitation.
2.5 oC
7 oC
17.5 oC
24 oC
28 oC
a.2.5 oC
b.7 oC
c.17.5 oC
d.24 oC
e.28 oC
Explanation / Answer
Let us find dew point, using Mark G. Lawrence equation,
which is given by:
Dew point, 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)
= 40- ((100-40)/5)
= 28 degree C
Condensation will occur at this temperature only, so our answer is e) 28 degree C
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