Gel comprised of a microporous solid in which the dispersed phase is a gas.
Note:
Microporous silica, microporous glass and zeolites are common examples of aerogels.
Source:
PAC, 2007, 79, 1801
(Definitions of terms relating to the structure and processing of sols, gels, networks,
and inorganic-organic hybrid materials (IUPAC Recommendations 2007))
on page 1806