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What's the DIN V18054?

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The k-value (thermal permeability coefficient) corresponds to the u-value which replaced the k-value.
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Kelvin For the indication of temperature differences, the unit degrees °C (degree or degrees Celsius) was replaced by the unit Kelvin, as the degree Celsius indicates no absolute zero. Nevertheless, despite the new definition for the indication of differences of Celsius temperatures, the Celsius degree is still used.
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