14708. A furnace is made of a red brick wall of thickness 0.5 m and conductivity 0.7 W/mK. For the same heat loss and temperature drop, this can be replaced by a layer of diatomite earth of conductivity 0.14 W/mK and thickness September 13, 2025 by Admin 0.5 m 0.1 m 0.2 m 0.5 m ✅ The correct answer is option B.