Under uniform conditions it is the ratio of the temperature difference across an insulator and the heat flux.

The R value of the insulator is defined to be 1 divided by the thermal conductance per inch.

In SI units, an R value of 1 equals 0.17611 square metre kelvins per watt (m2K/W).

See also: RSI, Thermal Conduction, Thermal Insulation.

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Subjects: Civil Engineering Thermodynamics