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Which of the following is the best insulator?

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+2 votes
in Food Processing Unit Operations by (110k points)
Which of the following is the best insulator?

(a) Silica aerogels

(b) Manganese aerogels

(c) Potassium aerogels

(d) Lead aerogels

I had been asked this question in a national level competition.

This interesting question is from Heat Conduction topic in chapter Heat Transfer Theory of Food Processing Unit Operations

1 Answer

+2 votes
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Best answer
Correct option is (a) Silica aerogels

The explanation is: The best insulator is silica aerogels. The thermal conductivities of silica aerogel is less than 0.03 W/m*K in atmosphere.The liquid is removed from the gel without collapsing its structure, thus creating air pockets in the medium. This slows down the heat transfer and act as the insulator.

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