Question 14
Change of State and VapoursT°C: 0, 5, 10, 15, 20, 40, 60
S.V.P (mmHg): 4.58, 6.51, 8.94, 12.67, 17.50, 55.10, 149.00
The table above shows the saturation vapour pressure against temperature in a certain town. If the vapour pressure in this town at 20°C is 10mmHg, what is the relative humidity?
- A.170.0%
- B.57.0%
- C.17.5%
- D.10.0%
Show the answer and explanation
Answer: B (57.0%)
Explanation
RH = actual vapour pressure ÷ SVP at that temperature × 100 = 10 ÷ 17.5 × 100 ≈ 57%.