Problem $3$

$(5$ points$)$

A sand has $G_n=2\mathrm{.}68.$ Calculate the lydrantic gradient that will cause boiling for $e=0\mathrm{.}4,e=0\mathrm{.}5,e=0\mathrm{.}6,$ and $e=0\mathrm{.}7.$ Plot a graph for $t_{er}$ versis $e.$