Vortex theory — (Chem. & Physics) The theory, advanced by Thomson (Lord Kelvin) on the basis of investigation by Helmholtz, that the atoms are vortically moving ring shaped masses (or masses of other forms having a similar internal motion) of a homogeneous,… … The Collaborative International Dictionary of English
Vortex dynamics — In 1858 Hermann von Helmholtz published his seminal paper entitled Über Integrale der hydrodynamischen Gleichungen, welche den Wirbelbewegungen entsprechen, in Journal für die reine und angewandte Mathematik , vol. 55, pp.25 55. So important was… … Wikipedia
History of knot theory — For thousands of years, knots have been used for basic purposes such as recording information, fastening and tying objects together. Over time people realized that different knots were better at different tasks, such as climbing or sailing. Knots … Wikipedia
History of electromagnetism — The history of electromagnetism, that is the human understanding and recorded use of electromagnetic forces, dates back over two thousand years ago, see Timeline of electromagnetism. The ancients must have been acquainted with the effects of… … Wikipedia
Toroidal ring model — The toroidal ring model, known originally as the Parson magneton or magnetic electron, is also known as the plasmoid ring, vortex ring, or helicon ring. This physical model treated electrons and protons as elementary particles, and was first… … Wikipedia
Knot theory — A three dimensional depiction of a thickened trefoil knot, the simplest non trivial knot … Wikipedia
Aether theories — See also the disambiguation page for Aether. Alchemy, natural philosophy, and early modern physics proposed the existence of a medium of the æther (also spelled ether , from the Greek word (Polytonic|αἰθήρ) aether , meaning upper air or pure,… … Wikipedia
Historia del electromagnetismo — La Historia del electromagnetismo, que es el conocimiento y el uso registrado de las fuerzas electromagnéticas, data de hace más de dos mil años. En la antigüedad ya estaban familiarizados con los efectos de la electricidad atmosférica, en… … Wikipedia Español
Ozone depletion — Image of the largest Antarctic ozone hole ever recorded (September 2006) Ozone depletion describes two distinct but related phenomena observed since the late 1970s: a steady decline of about 4% per decade in the total volume of ozone in Earth s… … Wikipedia
Superfluid — Superfluidity is a phase of matter or description of heat capacity in which unusual effects are observed when liquids, typically of helium 4 or helium 3, overcome friction by surface interaction when at a stage, known as the lambda point for… … Wikipedia
