1 . 56 × 10 5 J of heat is conducted through is 2 m 2 wall of 12 cm thick in one hour. The temperature difference between the two sides of the wall is 20 ℃ . What is the thermal conductivity of the material of the wall (in W m - 1 K - 1 )?

Step-by-step solution

d Q d t = K A ∆ T x 1.56 × 10 5 3600 = K × 2 × 20 12 × 10 - 2                       K = 1.56 × 10 5 × 12 × 10 - 2 3600 × 2 × 10                             = 1.56 12 = 0.13