The units of resistance to heat transfer is _____________________?
Correct answer: D. W-1m2K
- A. J.m-2.K-1
- B. J.m-1.K-1
- C. W.m-2.K-1
- D. W-1m2K
Explanation
Thermal resistance is defined as temperature difference divided by heat-transfer rate, giving units K/W, equivalent to W⁻¹m²K for an area-based resistance. The other choices represent conductivity, conductance, or heat-transfer-coefficient units.
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