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Thermal conductivity


What is thermal conductivity? Definition and explanation ...

The thermal conductivity (Symbol: κ), or too Thermal conductivity, is the ability of a substance / mixture to conduct heat. Opposite is the thermal resistance.
The thermal conductivity is measured using the formula: heat quantity / (meter * Kelvin). This simply means that heat, measured in watt-seconds, flows through a body, e.g. a cube. Between one side of the cube and the other side there is a temperature gradient of one Kelvin. The heat flows according to the second law of thermodynamics, from the warmer to the colder side. The higher the thermal conductivity, the greater the heat transfer per unit time.

Table: Thermal conductivity of some selected substances:

materialThermal conductivity in W / (m * K)
air0,02
methane0,03
Wood0,05
helium0,1
plastic0,2
water0,5
Glass0,8
granite2
concrete2
ice2
lead35
bronze45
tin70
iron80
nickel90
zinc100
aluminum210
gold320
copper380
silver400
diamond2000