The partial pressure of air and the barometric are 1 bar and 1.03 bar respectively. The saturation partial pressure of water vapour at the same dry bulb temperature is 0.05 bar. the relative humidity is

0.7

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0.6

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0.5

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0.8

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Solution

The correct option is B 0.6
$P_{a t m} = 1.03 b a r$

$P_{a i r} = 1 b a r$

$P_{v a p} = P_{a t m} - P_{a i r} = 1.03 - 1 = 0.03 b a r$

$P_{s a t}$ at DBT for vapour = 0.05 bar

$R e l a t i v e h u m i d i t y = \frac{P_{v}}{P_{m a x}} = \frac{0.03}{0.05} = 0.6$

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