Definition of "aerogel" []

• A highly porous solid formed from a gel, such as silica gel, in which the liquid is replaced with a gas. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Silica aerogel is an extemely low-density material derived from silicon based gel, in which the liquid component of the gel has been replaced with gas."
• "Silica aerogel is the most common type of aerogel and the most extensively studied and used."
• "This opened an completely new area in aerogel research."