Ultralight materials are solids with a density of less than 10 mg/cm3, including silica aerogels, carbon nanotube aerogels, aerographite, metallic foams, polymeric foams, and metallic microlattices. The density of air is about 1.275 mg/cm3, which means that the air in the pores contributes significantly to the density of the material.
- TA Schaedler; AJ Jacobsen; A Torrents; AE Sorensen; J Lian; JR Greer; et al. (18 November 2011). "Ultralight Metallic Microlattices". Science. 334 (6058): 962–965. PMID 22096194. doi:10.1126/science.1211649.
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