If e is actual vapour pressure and e_s is saturation vapour pressure, what happens to RH when e increases?
Answer and explanation
Correct answer: RH will increase
Relative humidity is calculated as RH = (e/e_s) × 100, where e is the actual vapour pressure and e_s is the saturation vapour pressure at the same temperature. If e_s remains constant and e increases, the numerator of the fraction becomes larger, so the value of RH increases. The air is therefore holding a greater proportion of the moisture required for saturation. It may reach 100% if e becomes equal to e_s. Thus, option B is correct.
Frequently asked questions
What is the correct answer to this question?
RH will increase
Why is this the correct answer?
Relative humidity is calculated as RH = (e/e_s) × 100, where e is the actual vapour pressure and e_s is the saturation vapour pressure at the same temperature. If e_s remains constant and e increases, the numerator of the fraction becomes larger, so the value of RH increases. The air is therefore holding a greater proportion of the moisture required for saturation. It may reach 100% if e becomes equal to e_s. Thus, option B is correct.
Which subject and chapter does this question cover?
This is a Class 12 Geography question. Chapter: Water in the Atmosphere. Topic: Humidity, evaporation, and condensation.
