Aerogel is the lightest solid material. It exhibits unique properties in mechanics, acoustics, thermics, optics, etc., and is used in many fields such as aerospace, military, medicine, building materials, electronics, metallurgy.
Aerogel is the best thermal insulation material with extremely low density, "endless" hollow walls can minimize thermal radiation. Aerogel can achieve a thermal insulation effect that other materials cannot match. The thermal conductivity coefficient of aerogel is lower than that of air (at normal atmospheric pressure): below 0.018 w/mk. For comparison: kt air = 0.025 w/mk.