For a given heat flow and for the same thickness, the temperature drop across the material will be maximum for
- A. Copper
- B. Steel
- C. Glass-wool
- D. Refractory brick
Answer: C. Glass-wool
Explanation: Q = k A dT / dx. dT = Q dx / k A. For constant Q and dx, dT is inversely proportional to k. Glass-wool has the lowest k (insulator), so dT is maximum.