Understanding Transient Heat Conduction in Semi-Infinite Solid

A semi-infinite solid is an idealized body that has a single plane surface and
extends to infinity in all directions. This idealized body is used to indicate that the temperature change in the part of the body in which we are interested (the region close to the surface) is due to the thermal conditions
on a single surface. A thick wall can be modeled as a semi-infinite medium if all we are interested in is the variation of temperature in the region near one of the surfaces, and the other surface is too far to have any impact on the region of interest during the time of observation.

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