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Haley also cited other technical considerations for that altitude, as it was approximately the altitude limit for an airbreathing jet engine based on current technology. In the same 1959 paper, Haley also referred to 295,000 feet (55.9 mi; 90 km) as the "von Kármán Line", which was the lowest altitude at which free-radical atomic oxygen occurred.
File:3D model hydrogen bonds in water.jpg: Author: User Qwerter at Czech wikipedia: Qwerter. Transferred from to Commons by sevela.p. Translated to english by by Michal Maňas (User:snek01). Vectorized by Magasjukur2: Other versions: File:3D model hydrogen bonds in water.jpg File:Vodikove mustky kalotovy model.jpg