The critical radius of insulation for a spherical shell is
$$\frac{thermal conductivity of insulating material}{heat transfer coefficient at the outer surface}$$
$$\frac{2 \times thermal conductivity of insulating material}{heat transfer coefficient at the outer surface}$$
$$\frac{thermal conductivity of insulating material}{2 \times heat transfer coefficient at the outer surface}$$
$$\frac{heat transfer coefficient at the outer surface}{thermal conductivity of insulating material}$$
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