On a particular hot day, the temperature is 40°C and the partial pressure of water vapor in the air is 38.8 mmHg. What is the relative humidity?
Attached Figure / Diagram
A
70
B
62
C
80
D
42
Verified Correct Answer: A.
Physical Principles & Numerical Solution
Relative Humidity= \(\frac {partial pressure of H2O}{saturated vapor pressure of H2O}\)\times100%
S.v.p. of water at 40^\circc = 55.3
⇒ Relative Humidity= \(\frac{38.8}{55.3}\)\times100%
Relative Humidity= 70%
Source: WAEC / JAMB / NECO Classroom Archive (Record #67275)