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In testing, isocetane (2,2,4,4,6,8,8-heptamethylnonane or HMN) replaced 1-methylnaphthalene as the low cetane number reference fuel in 1962 for reasons of better oxidation stability and ease of use in the reference engine. The scale is unchanged, as isocetane's cetane number is measured at 15, referenced to 1-methylnaphthalene and cetane. [3]
The bonds C1−C2, C3−C4, C5−C6 and C7−C8 are about 1.37 Å (137 pm) in length, whereas the other carbon–carbon bonds are about 1.42 Å (142 pm) long. This difference, established by X-ray diffraction , [ 21 ] is consistent with the valence bond model in naphthalene and in particular, with the theorem of cross-conjugation .
The structure of 1-Methylnaphthalene, a polycyclic aromatic hydrocarbon, or PAH. Date: 21 April 2008: Source: Own work: Author: Inductiveload: Permission (Reusing ...
Download as PDF; Printable version; In other projects ... move to sidebar hide. Methylnaphthalene may refer to: 1-Methylnaphthalene; 2-Methylnaphthalene; This ...
This Wikipedia page provides a comprehensive list of boiling and freezing points for various solvents.
Diagram showing positive tip polarity on the left and negative tip polarity on the right. To read diagram: The center positive drawing on the left indicates that the center (also known as the tip) of the output plug is positive (+) and the barrel (ring) of the output plug is negative (−). Center positive symbol Center negative symbol
Image credits: Detroit Photograph Company "There was a two-color process invented around 1913 by Kodak that used two glass plates in contact with each other, one being red-orange and the other ...
1,4-Naphthoquinone or para-naphthoquinone is a quinone derived from naphthalene. It forms volatile yellow triclinic crystals and has a sharp odor similar to benzoquinone . It is almost insoluble in cold water, slightly soluble in petroleum ether , and more soluble in polar organic solvents.