The least dense solid material is?

Foam

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SEAgel

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Agar-agar

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Bacterial plastic

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Solution

The correct option is C SEAgel
SEAgel (Safe emulsion agar gel) is one of a class of high-tech foam materials known as aerogels. It is an excellent thermal insulator and among the least dense solids known. SEAgel was invented by Robert Morrison at Lawrence Livermore National Laboratory in 1992.
So, option B is the correct option.

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