The critical radius of insulation for a spherical shell is (where, K = thermal conductivity of insulating material h₀ = heat transfer coefficient at the outer surface)

Question

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The critical radius of insulation for a spherical shell is given by the formula 2K/h₀, where K is the thermal conductivity of the insulating material and h₀ is the heat transfer coefficient at the outer surface.

The Critical Radius of Insulation for a Spherical Shell Is