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Thermal insulation is the method of inhibiting the transfer of thermal energy from one area to another. In other words, thermal insulation can keep an enclosed area such as a building warm, or it can keep the inside of a container cold.

Heat is transferred by from one material to another by conduction, convection and/or radiation. Insulators are used to minimize that transfer of heat energy. In home insulation, the R-value is an indication of how well a material insulates.

That's Why airplanes insulate heat.

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