science
Sometimes nicknamed 'frozen smoke,' this ghostly solid is made mostly of air trapped in a delicate network, making it one of the lightest solids known.
Aerogel is the ultralight material nicknamed 'frozen smoke' because it looks almost like a solid cloud, being made mostly of trapped air held within an extremely delicate, sponge-like network of solid material. This structure makes it one of the lightest solids ever created while still giving it enough rigidity to hold its shape and function as an outstanding thermal insulator.
Plywood is an ordinary engineered wood product made of glued layers of veneer, dense and heavy compared to aerogel, with no relation to its ghostly lightness. Granite is a dense natural rock used in construction and countertops, essentially the physical opposite of an airy, ultralight material like aerogel.
NASA has used aerogel to capture microscopic comet dust particles in space, since the material is gentle enough to slow and trap tiny fast-moving particles without destroying them, all while remaining light enough to launch cheaply.
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