Thermal contact conductance refers to the measure of the efficiency of heat transfer across an interface between two materials in contact. When two surfaces are in contact, they do not have perfect thermal connections due to surface roughness, material properties, and the presence of contaminants or insulating layers, which can impede the flow of heat. The thermal contact conductance (often denoted as \( h_c \)) quantifies how effectively heat can be conducted through this interface.
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