# What is thermal conductivity?

The thermal conductivity of a material of its ability to conduct heat
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The thermal conductivity of a material is a measure of its ability to conduct heat. It is commonly denoted by, or. Heat transfer occurs at a lower rate in materials of low thermal conductivity than in materials of high thermal conductivity.
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Thermal conductivity can be defined as the rate at which heat is transferred by conduction through a unit cross-section area of a material, when a temperature gradient exits perpendicular to the area.
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Thermal conductivity ? is defined as ability of material to transmit heat and it is measured in watts per square metre of surface area for a temperature gradient of 1 K per unit thickness of 1 m". Therefore, specific thermal conductivity is calculated as: ... = absolute thermal resistance (K/W, or ?C/W).
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