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*Ethers are a class of organic compounds that contain an ether group—an oxygen atom connected to two alkyl or aryl groups. They have the general formula R–O–R′, where R and R′ represent the alkyl or aryl groups. | *Ethers are a class of organic compounds that contain an ether group—an oxygen atom connected to two alkyl or aryl groups. They have the general formula R–O–R′, where R and R′ represent the alkyl or aryl groups. | ||
**Dimethyl ether is the organic compound with the formula CH₃OCH₃, simplified to C₂H₆O. The simplest ether, it is a colorless gas that is a useful precursor to other organic compounds and an aerosol propellant that is currently being demonstrated for use in a variety of fuel applications. It is an isomer of ethanol. | **Dimethyl ether is the organic compound with the formula CH₃OCH₃, simplified to C₂H₆O. The simplest ether, it is a colorless gas that is a useful precursor to other organic compounds and an aerosol propellant that is currently being demonstrated for use in a variety of fuel applications. It is an isomer of ethanol. | ||
*In literary, the clear sky; the upper regions of air beyond the clouds. | *In literary, ether mean the clear sky; the upper regions of air beyond the clouds. | ||
*In Archaic physics, a very rarefied and highly elastic substance formerly believed to permeate all space, including the interstices between the particles of matter, and to be the medium whose vibrations constituted light and other electromagnetic radiation. | *In Archaic physics, ether is a very rarefied and highly elastic substance formerly believed to permeate all space, including the interstices between the particles of matter, and to be the medium whose vibrations constituted light and other electromagnetic radiation. | ||
==List of appearances== | ==List of appearances== |
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