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The method of synthesizing silica aerogel is economical, and the process is very versatile. Silica aerogels are best known for tremendously combining low thermal conductivity with high optical transparency. They are transparent; however, due to the Rayleigh scattering effect, they appear to be blue and are hence commonly called frozen smoke or blue smoke. The high insulating properties, low cost, abundant raw material availability, and the versatile process of manufacturing are driving the silica-based aerogel market. Silica is the first type of aerogel to be made commercially available. Silica aerogel materials are particularly intriguing due to their ultra-low weight and transparency. A visibly transparent super-insulating material is compatible for many applications.