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Air is not a good conductor of heat because it, being a gas with only a few particles in a big space, cannot store much energy by volume as it doesn't have much material in which to store the energy.

However, air can move heat by convection, which means by moving and circulating it can transport the heat from one place to another. Because air moves with very little resistance it can easily move a lot of heat this way.

So air is good insulation only if it is in very small pockets where the air cannot circulate easily. A lot of insulators actually trap tiny pockets of air to create insulation, such as foam or even fine knitted clothing.

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16y ago

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In Over Head Transmission Line How air is providing most of Insulation as per Wikipedia Please Clarify?

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