The definition of the thermal conductivity is the amount of heat that goes through a particular thickness of material at a particular temperature. The International System of units (SI units) for the thermal conductivity is W/mK. Basically, this means that every material has its own capacity of heat transfer and so its own insulating properties. What does this involve when using an insulating material in a building, for example? The material with the lowest thermal conductivity corresponds to the highest insulation, which leads to lower heating/cooling costs for the building maintenance. The building construction would also require thinner walls and roofs to comply with the Building Regulations. On top of this it will also save money!

The overall thermal conductivity of a material is the combination of four components:

  1. Thermal conductivity of the solid material's structure
  2. Thermal conductivity of the cell gas
  3. Thermal convection of the gas in the cell
  4. Thermal radiation

Find out more details on these components on the full article.

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