$10\mathrm{.}4$ Examine the following experimental data for water in the light of equations $(10\mathrm{.}12)$ and $(10\mathrm{.}16).$

$\backslash$table$[[$temperature $\frac{?}{?}C,0,5,10,15,20],[$vapour pressure $\frac{?}{mmHg},4\mathrm{.}581,6\mathrm{.}536,9\mathrm{.}198,12\mathrm{.}77,17\mathrm{.}51],[$temperature $\frac{?}{?}C,25,30,35,40,],[$vapour pressure $\frac{?}{mmHg},23\mathrm{.}73,31\mathrm{.}79,42\mathrm{.}14,55\mathrm{.}29,],[$For water vapour, $c_p=1\mathrm{.}9kJ{K}^{-1}k{g}^{-1}.,,,,,]]$