Ether | Substance, Aether, Wave Theory | Britannica
https://www.britannica.com/science/ether-theoretical-substance
WEBether, in physics, a theoretical universal substance believed during the 19th century to act as the medium for transmission of electromagnetic waves (e.g., light and X-rays ), much as sound waves are transmitted by elastic media such as air. The ether was assumed to be weightless, transparent, frictionless, undetectable chemically or physically ...
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