The "R-Value" Is Stamped onto Insulating Material to Indicate the "Thermal

question 17

Essay

The "R-value" is stamped onto insulating material to indicate the "thermal resistivity" of the material, and is proportional to the inverse of the thermal conductivity coefficient k. The units of R are (foot²)(°F)(British thermal unit/hour)^-1(inch^-1). Find the equation that relates R-values to thermal conductivity when the latter is expressed in SI units (Wm^-1K^-1).

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