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string theory

(Encyclopedia)string theory, description of elementary particles based on one-dimensional curves, or “strings,” instead of point particles. Superstring theory, which is string theory that contains a kind of sym...

BCS theory

(Encyclopedia)BCS theory: see superconductivity. ...

molecular orbital theory

(Encyclopedia)molecular orbital theory, detailed explanation of how electrons are distributed in stable molecules. In the simpler valence theory of the chemical bond, each atom in a molecule is assumed to retain it...

games, theory of

(Encyclopedia)games, theory of, group of mathematical theories first developed by John Von Neumann and Oskar Morgenstern. A game consists of a set of rules governing a competitive situation in which from two to n i...

quantum field theory

(Encyclopedia)quantum field theory, study of the quantum mechanical interaction of elementary particles and fields. Quantum field theory applied to the understanding of electromagnetism is called quantum electrodyn...

steady-state theory

(Encyclopedia)steady-state theory: see cosmology. ...

Young-Helmholtz theory

(Encyclopedia)Young-Helmholtz theory: see vision. ...

big-bang theory

(Encyclopedia)big-bang theory: see cosmology.

kinetic-molecular theory of gases

(Encyclopedia)kinetic-molecular theory of gases, physical theory that explains the behavior of gases on the basis of the following assumptions: (1) Any gas is composed of a very large number of very tiny particles ...

number-average molecular weight

(Encyclopedia)number-average molecular weight: see molecular weight. ...