Units of Thermal Conductivity
The dimension of thermal conductivity is M1L1T−3Θ−1. These variables are (M)mass, (L)length, (T)time, and (Θ)temperature. In SI units, thermal conductivity is measured in watts per meter kelvin (W·m−1·K−1). In Imperial units, thermal conductivity is measured in BTU/(hr·ft⋅F).
Other units which are closely related to the thermal conductivity are in common use in the construction and textile industries. The construction industry makes use of units such as the R-value and the U-value. Although related to the thermal conductivity of a material used in an insulation product, R and U-values are dependent on the thickness of the product.
Likewise the textile industry has several units including the tog and the clo which express thermal resistance of a material in a way analogous to the R-values used in the construction industry.
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