A

A physical field can be thought of as the assignment of a physical quantity at each point of space and time. For example, in a weather forecast, the wind velocity during a day over a country is described by assigning a vector to each point in space. Each vector represents the direction of the movement of air at that point. As the day progresses, the directions in which the vectors point change as the directions of the wind change. From the mathematical viewpoint, classical fields are described by sections of fiber bundles (covariant classical field theory).

Descriptions of physical fields were given before the advent of relativity theory and then revised in light of this theory. Consequently,

In 1839 James MacCullagh presented field equations to describe reflection and refraction in "An essay toward a dynamical theory of crystalline reflection and refraction". Wikipedia, Classical Field Theory

See Also

**classical field theory**is a physical theory that predicts how one or more physical fields interact with matter through field equations. The term '**classical field theory**' is commonly reserved for describing those physical theories that describe electromagnetism and gravitation, two of the fundamental forces of nature. Theories that incorporate quantum mechanics are called quantum field theories.A physical field can be thought of as the assignment of a physical quantity at each point of space and time. For example, in a weather forecast, the wind velocity during a day over a country is described by assigning a vector to each point in space. Each vector represents the direction of the movement of air at that point. As the day progresses, the directions in which the vectors point change as the directions of the wind change. From the mathematical viewpoint, classical fields are described by sections of fiber bundles (covariant classical field theory).

Descriptions of physical fields were given before the advent of relativity theory and then revised in light of this theory. Consequently,

**classical field theories**are usually categorised as non-relativistic and relativistic. Modern field equations tend to be tensor equations.In 1839 James MacCullagh presented field equations to describe reflection and refraction in "An essay toward a dynamical theory of crystalline reflection and refraction". Wikipedia, Classical Field Theory

See Also

**Center Theory****classical mechanics****classical physics****depolar field****Electromagnetic Field****ether theory****field****Field Physics****H Field****magnetic field****Magnetic Fields Ball Lightning and Campanology****neutral field****One More Step Toward Building The Cube-Sphere Wave-Field****Plants as Detectors of the Biofield****polar field****Quantum Field Theory****Rotating Magnetic Field****sympathetic field****theory of relativity****vector field****Wave Field****Wave Fields - Summarize and Simplify****We Now Build the Nine Equators of Cube-Sphere Wave-Fields**