Back Eter (klassieke element) Afrikaans أثير Arabic Eter (klasikong elemento) BCL Эфір (стыхія) Byelorussian ইথার (শাস্ত্রীয় উপাদান) Bengali/Bangla Èter (element) Catalan ئەسیر CKB Éter (živel) Czech Quintessenz (Philosophie) German Αιθέρας (ουσία) Greek
| Classical elements |
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According to ancient and medieval science, aether (/ˈiːθər/, alternative spellings include æther, aither, and ether), also known as the fifth element or quintessence, is the material that fills the region of the universe beyond the terrestrial sphere.[1] The concept of aether was used in several theories to explain several natural phenomena, such as the propagation of light and gravity. In the late 19th century, physicists postulated that aether permeated space, providing a medium through which light could travel in a vacuum, but evidence for the presence of such a medium was not found in the Michelson–Morley experiment, and this result has been interpreted to mean that no luminiferous aether exists.[2]
- ^ Cite error: The named reference
Lloydwas invoked but never defined (see the help page). - ^ Carl S. Helrich, The Classical Theory of Fields: Electromagnetism Berlin, Springer 2012, p. 26.