b$)$ A wet and dry bulb thermometer is kept in atmosphere if WBT is $80C.$ Find $DBT$ by Chilton Colburn anology.

Data: $P_W=2\mathrm{.}1k\frac{N}{m^2},=2459k\frac{J}{k}g,$

${}_{\text{a}\text{i}\text{r}}=1\mathrm{.}2k\frac{g}{m^3},C_P=1k\frac{J}{k}g*K,P{R}_r=0\mathrm{.}72,$

$S_C=0\mathrm{.}61$