Question

At $-2{}^{\circ }C$ the relative humidity at Kashmir is $70\%$. For a particular region, the maximum water that air can hold is $25g$. Calculate the amount of water vapour present in the air per unit volume.
4

• A. 25.5 gm
• B. 13.5 gm
• C. 17.5 gm
• D. 9.5 gm

Answer 1

The correct option is C 17.5 gm

Given:
Relative humidity = 70 % = 0.7
$\mathrm{Realive}\mathrm{humidity}=\frac{\mathrm{Amount}\mathrm{of}\mathrm{water}\mathrm{in}\mathrm{the}\mathrm{air}}{\mathrm{Maximum}\mathrm{water}\mathrm{that}\mathrm{air}\mathrm{can}\mathrm{hold}}$
$Waterpresentintheair=relativehumidity\times maximumwaterthataircanhold$ = 0.7 * 25
= 17.5 gm

Amount of water vapour present in the air per unit volume is 17.5 gm.