What is the k-value R-value and U-value glass or material?

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What is the k-value R-value and U-value glass or material?

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Each material has different capabilities and transmission of heat radiation, known as the conductivity, which is measured as a watt of energy transmitted cubic meter of material (sq. meter area and thickness) by stupnnju difference in temperature between the two sides of the material. Conductive material is expressed as a k-value (sometimes written, the Greek letter Λ (lambda). K-value is based on the standard thickness of 1m and is very useful for comparing two kinds of materials, but wrong when comparing different thickness. For example, concrete has high conductivity with k-values around 1, and we can say that 1m ² 1m thick concrete implemented 1W power when the temperature 1 degree difference on two sides of the cubes of concrete. If the difference in temperature of 10 ° on the two sides of the conductivity will be 10W. is expressed as k = W / mK Durability of materials on heat transfer expressed as R-value, shows the characteristics of the material one meter square area, and used

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