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  • © 2014, American Institute of Aeronautics and Astronautics Inc. All rights reserved. The one-dimensional unsteady conduction in a solid with an air gap on the order of 100 microns is simulated using a 1-dimensional conduction solver. A temperature jump boundary condition is implemented. These results show that the change in Knudsen number as the density of the air gap changes will have a large impact on the unsteady heat transfer within the material. This magnitude of this effect depends on the frequency of the unsteady temperature disturbance.