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Silica aerogel is the most common type of aerogel and the most extensively studied and used. It is a silica-based substance, derived from silica gel. The world's lowest-density solid is a silica nanofoam at 1 mg/cm3,[5] which is the evacuated version of the record-aerogel of 1.9 mg/cm3.[6] The density of air is 1.2 mg/cm3.[7]

Silica aerogel strongly absorbs infrared radiation. It allows the construction of materials that let light into buildings but trap heat for solar heating.

It has remarkable thermal insulative properties, having an extremely low thermal conductivity: from 0.03 W/m·K[8] down to 0.004 W/m·K,[5] which correspond to R-values of 14 to 105 for 3.5 inch thickness. For comparison, typical wall insulation is 13 for 3.5 inch thickness. Its melting point is 1,473 K (1,200 °C or 2,192 °F).

Silica aerogel holds 15 entries[citation needed] in Guinness World Records for material properties, including best insulator and lowest-density solid.