The most common way of expressing thermal properties is by using the following nomenclature:

  • Coefficient of the Thermal Transmission (U-value)
  • Thermal Resistance (R)

It is important to note that the λ-value for any given material varies with temperature specification of the λ-value should therefor be referred to as "mean" temperature and, if possible, to a standardised method for measuerement and calculation.

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