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A material that does not conduct heat very well is known as an insulator.

For practical purposes, air is an excellent insulator, and thus fluffy porous materials are good insulators.

In detail, the material should be compressed to the point where the heat transfer through conduction along the fibres of the material; is equal to that transferred by convection in the air cells.

Both more compression and less compression of the material will degrade the performance.

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14y ago

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