Question

The relative humidity of air is $\text{80\%}$ at $\text{27}{}^{\text{o}}\text{C}\text{.}$ .If the aqueous tension at the same temperature is $\text{27}\text{mm}$ of $\text{Hg}\text{.}$ The partial pressure of water vapour in the air will be (in $\text{mm}$ of $\text{Hg}$ ).

Answer 1

Answer: 21.6

Relative humidity $=\frac{Partialpressure}{Vapourpressure}\times 100$

$\Rightarrow \frac{Partialpressure}{27}\times 100=80$

$\Rightarrow Partialpressure=\frac{80\times 27}{100}$

$\therefore Partialpressure=21.6mm$ of Hg