美国国家宇航局下属的喷气推进实验室材料科学家史蒂芬·琼斯博士新近研制出了一种新型的气凝胶,由于密度只有3毫克/立方厘米,是世界上密度最低的固体。这种气凝胶呈半透明淡蓝色,重量极轻,因此人们也把它称为“固态烟”。它的主要成分和玻璃一样也是二氧化硅,但因为它99.8%都是空气,所以密度只有玻璃的千分之一。 Dr. Steven Jones, a materials scientist at the National Aeronautics and Space Administration’s Jet Propulsion Laboratory, recently developed a new kind of aerogel, which is the world’s lowest density solid because it has a density of only 3 mg/cm3. This aerogel is translucent light blue, light weight, so people also call it “solid smoke.” Its main ingredient is silica, just like glass, but because it is 99.8% air, the density is only one thousandth of glass.