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I'm really struggling to understand the science behind wool, and why it's a good insulator. I'm doing an investigation about heat transfer, and the topic I chose is insulators.

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    $\begingroup$ I'm voting to close this question as off-topic because it shows insufficient prior research. Results are immediately available for the google search "why is wool a good insulator?" $\endgroup$ – user191954 Sep 11 '18 at 2:46
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The best insulation is air, actually it must be trapped air (not allowed to convect). Wool traps the air, similar to fibreglass or other home insulators.

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Wool is a good insulator as it traps air in it and prevents it to flow out carrying heat with it and thus prevents lowering temperature of body

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