Conduction comparison across geometries: thick sphere versus thick cylinder Assess the statement: Heat transfer by conduction through a thick spherical wall is the same as through a thick cylindrical wall. Choose the correct truth value.

Concept/Approach
In steady radial conduction, the governing area for heat flow varies with radius: A_cyl = 2πrL (cylinder) versus A_sph = 4πr² (sphere). This leads to different analytical forms for thermal resistance and heat rate.

Consequences
For a cylinder: Q = 2πkL (T₁ − T₂) / ln(r₂/r₁). For a sphere: Q = 4πk (T₁ − T₂) / (1/r₁ − 1/r₂).

Final Answer
False — the conduction relations are different for thick spheres and thick cylinders.