Pick out the wrong unit conversion of thermal conductivity ?
Correct answer: B. 1 BTU/ft2.hr.°F/inch = 1.488 kcal/m2. hr.°C/m
- A. 1 BTU/ft2.hr.°F/ft = 1.488 kcal/m2. hr.°C/m
- B. 1 BTU/ft2.hr.°F/inch = 1.488 kcal/m2. hr.°C/m
- C. 1 kcal/m.hr.°C = 0.672 BTU/ft.hr.°F = 1.163 W/m. °K
- D. 1 W/cm.°C = 85.985 kcal/m.hr.°C = 57.779 BTU/ft.hr.°F
Explanation
The first conversion is for conductivity units equivalent to BTU/(ft·hr·°F), giving 1.488 kcal/(m·hr·°C). Dividing by an inch rather than multiplying the foot-based denominator changes the factor by 12, so option B is the incorrect conversion.
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