# Torsion

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**Torsion** may refer to:

## Science

- [Torsion (mechanics)](/source/Torsion_(mechanics)), the twisting of an object due to an applied torque
- Torsion of spacetime, the field used in [Einstein–Cartan theory](/source/Einstein%E2%80%93Cartan_theory) and - [Alternatives to general relativity](/source/Alternatives_to_general_relativity)
- [Torsion angle](/source/Torsion_angle), in chemistry

### Biology and medicine

- [Torsion fracture](/source/Torsion_fracture) or spiral fracture, a bone fracture when torque is applied
- Organ torsion, twisting that interrupts the blood supply to that organ: - Splenic torsion, causing [splenic infarction](/source/Splenic_infarction) - [Ovarian torsion](/source/Ovarian_torsion) - [Testicular torsion](/source/Testicular_torsion)
- [Penile torsion](/source/Penile_torsion), a congenital condition
- Torsion of the digestive tract in some domestic animals: - Torsion, a type of [horse colic](/source/Horse_colic#Torsion_and_volvulus) - [Gastric torsion](/source/Gastric_torsion), or gastric dilatation volvulus
- [Torsion (gastropod)](/source/Torsion_(gastropod)), a developmental feature of all gastropods

## Mathematics

- [Torsion of a curve](/source/Torsion_of_a_curve)
- [Torsion tensor](/source/Torsion_tensor), in differential geometry
- [Torsion (algebra)](/source/Torsion_(algebra)), in ring theory
- [Torsion group](/source/Torsion_group), in group theory and arithmetic geometry
- [Tor functor](/source/Tor_functor), the derived functors of the tensor product of modules over a ring
- [Torsion-free module](/source/Torsion-free_module), in algebra - See also [Torsion-free (disambiguation)](/source/Torsion-free_(disambiguation))
- [Analytic torsion](/source/Analytic_torsion) (Reidemeister torsion, R-torsion, Franz torsion, de Rham torsion, Ray-Singer torsion), a topological invariant of manifolds
- [Whitehead torsion](/source/Whitehead_torsion), in geometric topology

## Other uses

- [Torsion field (pseudoscience)](/source/Torsion_field_(pseudoscience)), a field alleged to make faster-than-light communication and paranormal phenomena possible

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Adapted from the Wikipedia article [Torsion](https://en.wikipedia.org/wiki/Torsion) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Torsion?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.