topicmaker Veteran


Joined: 28 Feb 2006 Posts: 25812
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Posted: Wed Feb 25, 2015 12:44 am Post subject: What The Lowest-Density Solid On Earth Sounds Like |
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Aerogel is almost entirely air. It's manufactured for a number of reasons - including its lightness and low thermal conductivity - but the unusual sound it makes is just gravy on top.
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