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A given volume of air actually contains 9 g of water vapour, while 15 g would be needed to saturate it at that temperature. The relative humidity of the air is:
A166%
B6%
C24%
D60%
Answer & Solution
Correct answer: D. 60%
1. Relative humidity (%) = (actual vapour mass / saturation vapour mass) × 100.
2. Substitute: $\dfrac{9}{15} \times 100$.
3. $= 0.6 \times 100 = 60\%$.
4. Inverting the ratio gives 166%, which exceeds 100% and is physically impossible here, so it is rejected.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 5 "Heat", p.75_
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