Question

why ice box are made as double ​

Answer 1

Ice boxes are used to store ice, so that they can't get melt. Providing ice boxes with two walls or double walls allow the ice box to have complete and easy insulation of heat. Hence, ice box provides proper insulation by the two provided walls

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Answer 2

Answer:

Ice boxes are used to store ice, so that they can't get melt. Providing ice boxes with two walls or double walls allow the ice box to have complete and easy insulation of heat. Hence, ice box provides proper insulation by the two provided walls.