The mass of water vapour in a given volume of air is 0.05g at 20^\circC, while the mass of water vapour required to saturate it at the same temperature is 0.15g. Calculate the relative humidity of the air.
A
3.33%
B
5.55%
C
33.33%
D
55.55%
Verified Correct Answer: C.
Physical Principles & Numerical Solution
RH
=
mass of water vapour in volume of air
mass of water vapour for saturation
RH
=
m
M
=
0.05
0.15
\times
100
=
5
0.15
=
500
15
=
33.33%
Source: Myschool Past Questions Archive (Record #55759)