aerogel
Noun
Meaning
aerogel (countable and uncountable, plural aerogels)
A porous, ultralight solid-state substance, similar to gel, in which the liquid component is replaced with gas.
Phrases with the word
Examples
Almost all solids and liquids have refractive indices above 1.3, with aerogel as the clear exception.
Virtually any fluid can be used as an extender including water ( hydrogels ), oil, and air ( aerogel ).