QUESTION $2$: An air mass has a wet$-$bulb temperature of $23C$ and the corresponding vapour

pressure of $25$ mbar. If the relative humidity and saturation deficit of the air mass are $45\%$ and

$20$ mbar $,$ respectively, calculate:

a$)$ the saturation vapour pressure $($mbar$)$;

b$)$ the actual vapour pressure $($mbar$)$;

c$)$ the air temperature $(C)$;

$(e_w-e)=(t-t_w),(=0\mathrm{.}66)$