### physical field

**(field)**
(physical property of some volume of space)

A **physical field**, i.e., what is termed a **field** within physics,
is an entity consisting of some physical property of
the space within some particular volume. A common
use of the term is regarding the effects of gravity,
i.e., a gravitational field (e.g., Earth's
gravitational field), with other types being electric fields
and magnetic fields. In each case, the physical property is
some force that affects some objects within the field, and
the effects of other forces (strong force and **weak force**)
also constitute such fields. The natural way to describe such
fields is using a corresponding mathematical field.

Generally such fields do not actually have a border, but fade to
insignificance with distance from their strongest region. For
example, Earth's gravitational field contributes to gravity at all
distances, but its strength falls, and at some distance from Earth,
the Sun's gravitational field is sufficiently strong that
Earth's has very little effect. A gravitational field that is the
sum of that of Earth and the Sun (and the other solar system
planets) can be considered, as well as throughout the Milky Way
and even the universe.

Objects can be thought of as "causing" fields, but also can be
modeled as being fields, the object defined by its effect on its
surroundings. **Quantum electrodynamics** (**QED**) can be thought of
as a quantum theory devised to handle fields (such
as electric fields), more-or-less by treating particles as
fields and providing the means to describe the interactions of such
fields (in such a way to include quantum effects).

(*physics*)
**Further reading:**

http://en.wikipedia.org/wiki/Field_(physics)

**Referenced by pages:**

conformal field theory (CFT)

effective field theory (EFT)

electric field (E)

field lines

mathematical field

Poisson's equation

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