$1-67$ An engineer who is working on the heat transfer analysis of a brick building in English units needs the thermal conductivity of brick. But the only value he can find from his handbooks is $0\mathrm{.}72\frac{W}{m*C},$ which is in SI units. To make matters worse, the engineer does not have a direct conversion factor between the two unit systems for thermal conductivity $($he should have kept his heat transfer textbook instead of selling it back to the bookstore$).$ Can you help him out?