polar molecule


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Polar molecule

A molecule possessing a permanent electric dipole moment. Molecules containing atoms of more than one element are polar except where forbidden by symmetry; molecules formed from atoms of a single element are nonpolar (except ozone). The dipole moments of polar molecules result in stronger intermolecular attraction, increased viscosities, higher melting and boiling points, and greater solubility in polar solvents than in nonpolar molecules.

McGraw-Hill Concise Encyclopedia of Physics. © 2002 by The McGraw-Hill Companies, Inc.

polar molecule

[′pō·lər ′mäl·ə‚kyül]
(physical chemistry)
A molecule having a permanent electric dipole moment.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
This phenomenon was opposite to theory and the reasons were as follows: on one hand, the dielectric constant depended on orientation polarization since SCE-[Al.sub.2][O.sub.3] was polar molecule. The surface of SCE-[Al.sub.2][O.sub.3] was coated with ethanol molecule and the polar groups of SCE-[Al.sub.2][O.sub.3] would adsorb ethanol molecules, which led the polarity of SCE-[Al.sub.2][O.sub.3] to decline.
The electromagnetic energy upsets the hydrogen bonds associated with the dipole rotation of polar molecules. With the ionic interactions, the electric field causes the migration of ions.
A polar molecule is a molecule that has a slightly positive encl and a slightly negative end.
Although acetonitrile and water elution have commonly been employed for the separations of weakly polar molecules in TCMs, the elution performs poorly in the separation of highly polar molecules.
When dipoles are exposed to moderate electromagnetic field frequency, the polar molecules will try to orientate themselves by following delay according to the field polarity as shown in Fig.
Wang's team at the University of California, Riverside, turned instead to a different type of non-covalent bond called an ion-dipole interaction, a force between charged ions and polar molecules. "Ion-dipole interactions have never been used for designing a self-healing polymer, but it turns out that they're particularly suitable for ionic conductors," Wang says.
It also has a special bond called an ion-dipole interaction that creates a force between charged ions and polar molecules. When the molecules are torn apart or scratched, they attract to each other and repair themselves.
The 12 lectures identify new directions in the field of ultracold physics, such as quantum gases with long range interactions, either due to strong magnetic dipole forces, due to Rydberg excitations, or, for polar molecules due to electric dipole interactions; quantum gases in lower dimensions; quantum gases with disorder; atoms in optical lattices, now with single-site optical resolution; systems with non-trivial topological properties such as spin-orbit coupling or in artificial gauge fields; quantum impurity problems (Bose and Fermi polarions); and quantum magnetism.
The material to be treated is conveyed through an electrode array where this alternating energy causes polar molecules in the material to continuously reorient themselves to face opposite poles much like the way bar magnets behave in an alternating magnetic field.