(redirected fromDispersion Forces) Medical Encyclopedia van der Waals force n. A weak, short-range attractive force between atoms or molecules caused by their dipole moments, often arising in otherwise nonpolar atoms or molecules from a temporary shift of orbital electrons to one side of one atom...
These forces are electrostatic in nature and are referred to as intermolecular forces. This implies that they are caused by the attraction of negative and positive charges. The negative charge in a molecule is caused by the concentration of electrons in the cloud on one end, and the positive...
These forces are caused by interactions between permanent or temporary dipoles in the molecules. Dispersion forces, on the other hand, are a type of van der Waals force that results from the temporary dipoles that occur due to fluctuations in electron distribution in molecules. In simpler terms...
the energy of translational motion will be less than in the case when there are no inner degrees of freedom. Since the elasticity of a gas is determined by the energy necessary for translational motion of the molecules, then the elasticity of gas, as well as the speed of sound, will also...
19.Section 123 ( b ) treats intermittent controls as a form of dispersion technique. 第123条 ( b ) 把间歇性控制也当作弥散技术的一种形式. 20.Van der Wals forces between neutral atoms are called dispersion forces. 中性原子间的范德华力叫做色散力....
London dispersion forces are ultimately electromagnetic in origin, while gravity is another one of the fundamental forces. The two are not related, unless you happen to believe that they're both manifestations of a single unified force. 回复 3楼 2009-04-30 12:29 举报 |登录...
of the physical parameters (Schmidt number) and quantities pertaining to the particles (average solid volume fraction, particle Reynolds number, and particle Stokes number), and a dimensionless shear strain group which represents the ratio of interparticle-collision forces to fluid viscous forces. For...
The forces governing the dispersal of organisms are either vectorial (directed motion), that is, caused by wind, water, or some other environmental motion, or stochastic (random), as in the case of the change in seasons, which gives no indication of where the dispersing organisms may ...
On the other hand, the tidal frequencies are known a priori, from the analytical expression of the tide-generating forces (Godin, 1961). Thus, in tidally-dominated environments, the elevation of the free surface and the current velocity can be each expressed, as a sum of a finite series ...