In
physics, a field is an assignment of a physical quantity to every point in space (or, more generally,
spacetime). A field is thus viewed as extending throughout a large region of space so that its influence is all-pervading. The strength of a field usually varies over a region. Fields are usually represented mathematically by
scalar,
vector and
tensor fields. For example, one can model a
gravitational field by a vector field where a vector indicates the acceleration a mass would experience at each point in space. Other examples are temperature fields or air pressure fields, which are often illustrated on weather reports by
isotherms and
isobars by joining up the points of equal temperature or pressure respectively.
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