Aerogel

Aerogel - perhaps the most unusual material in the world. In the Guinness book of records he deservedly holds 15 records. It is sometimes called "frozen smoke". This material was prepared by drying the liquid gel ekstrasilnoj containing aluminum, chromium or carbon. Its fantastic properties - density of individual species such substance is equal to or one and a half to two times greater than the density of air. Cubic meter of it weighs only 2 kg. The thermal conductivity of the airgel is so small that it is often used for thermal insulation in space. The melting point is 1200 degrees - rather big quantity. Such a substance is practically not miss the sound, heat and impact. Body armor using a one centimeter layer of such a "gel" allows you to survive the direct impact of the explosion kilograms of dynamite.
Despite its name (aerogels), the substance is a solid material, the structure resembling shaving foam. Besides all this, it is transparent, sometimes with a bluish tint. So, in one material collected some of the most unusual features, the combination of which makes it unique.