molecules collide
111Collisional excitation — is a process in which the translational energy of a collision partner is converted into the internal energy of a reactant species. Astronomy In astronomy, collisional excitation gives rise to spectral lines in the spectra of astronomical objects… …
112Hot filament ionization gauge — Infobox Laboratory equipment name = Hot filament ionization gauge caption = Bayard Alpert hot thoriated iridium filament ionization gauge on 2.75 in conflat flange acronym = other names = Hot cathode gauge Bayard Alpert gauge uses = Pressure… …
113Ballistic conduction — is the characteristic of a material, known as a ballistic conductor , which has crystalline properties that allow electrons to flow through the material without collisions. The material must be free of impurities that electrons could collide with …
114Van Allen radiation belt — ☆ Van Allen radiation belt [van al′ən ] n. 〚after James A. Van Allen (1914 ), U.S. physicist〛 1. a broad, doughnut shaped region surrounding the earth and composed of high energy electrons and protons trapped in the earth s magnetic field at… …
115collision — 01. One man is dead, and another in hospital after a [collision] between a truck and a sports car on the highway this morning. 02. Balou was slightly injured in the basketball game after [colliding] with another player on his team. 03. The pilots …
116Fluid dynamics — Continuum mechanics …
117Moon — This article is about Earth s Moon. For moons in general, see Natural satellite. For other uses, see Moon (disambiguation) …
118Snow — Snowfall redirects here. For other uses, see Snow (disambiguation) or Snowfall (disambiguation). Snow is a type of precipitation in the form of crystalline water ice, consisting of a multitude of snowflakes that fall from clouds. The process of… …
119X-ray — [ 22 December 1895 and presented to Professor Ludwig Zehnder of the Physik Institut, University of Freiburg, on 1 January 1896. The dark oval on the third finger is a shadow produced by her ring. [cite book last = Kevles first =Bettyann Holtzmann …
120Mountain — For other uses, see Mountain (disambiguation). Chimborazo …
