Frozen Smoke?
Translucent, ethereal blue and over 96% air, aerogels are the lightest solids in the world. They're not actually frozen smoke-they're an artificial material-but the nickname fits. Aerogels are actually pretty remarkable-they're the world's best insulators, being extremely porous but low in density; they can withstand explosive damager; and they can support several thousand times their weight. Silica-based aerogels are quite fragile, but newer polymer-based ones are extremely strong and flexible.
Aerogels have been used to insulate electronics on a Mars Rover, and because they'll perform well in differeny gravity situations, they have a lot of space-related applications such as in space suits or for use in cryogenics. There are more down-to-Earth applications too, such as insulating blankets or tents, and uses in refrigeration and construction.
