Determine the conduction heat transfer through an air layer held between two $10$ mm $\backslash$times $10$ mm parallelaluminum plates. The plates are at temperatures Ts$,1=305$ K and Ts$,2=295$ K$,$ respectively, and the air isat atmospheric pressure. Determine the conduction heat rate for plate spacings of L $=1\mathrm{.}0$ mm$,$ L $=1\mathrm{.}2$ um$,$and L $=30$ nm$.$ Assume a thermal accommodation coefficient of a$,=0\mathrm{.}92.$ For air, the molecular weight is$28\mathrm{.}97$ kg$/$kmol and the molecular diameter is $0\mathrm{.}372$ nm$.$