Worlds Lightest Solid: Aerogel

Aerogel is the lightest and lowestdensity solid in the world. Its a gel composed of air. Looking like frozen smoke, this material is almost as light as air itself. Its only 1. 74 grams. Its so light that even soap bubbles can lift it. Despite its weight, it can withstand extreme temperatures from 275 degrees Celsius to 650 degrees Celsius and provides a protection against heat unlike anything else on Earth. However, even with a small pressure applied by my finger, the aerogel shatters into thousands of pieces and turns to dust. But whats surprising is that if I take those aerogel dusts and apply it to any surface, like my body, it becomes 100 hydrophobic. It makes me completely waterproof. On top of that, this dust also forms new nonbrittle foamlike aerogel composites, which can be utilized in extreme applications requiring protection. Aerogels can be in different shapes, given that they are 99 air, can you guess the kind of sound would an aerogel make Its like br, br,