Torsion may refer to:

Science

Torsion (mechanics) In the field of solid mechanics, torsion is the twisting of an object due to an applied torque. Torsion could be defined as strain or angular deformation, and is measured by the angle a chosen section is rotated from its equilibrium position. Th ...

, the twisting of an object due to an applied torque * Torsion of spacetime, the field used in Einstein–Cartan theory and ** Alternatives to general relativity * Torsion angle, in chemistry

Biology and medicine

* 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 ** Ovarian torsion **

Testicular torsion Testicular torsion occurs when the spermatic cord (from which the testicle is suspended) twists, cutting off the blood supply to the testicle. The most common symptom in children is sudden, severe testicular pain. The testicle may be higher tha ...

* Penile torsion, a congenital condition * Torsion of the digestive tract in some domestic animals: ** Torsion, a type of

horse colic Colic in horses is defined as abdominal pain, but it is a clinical symptom rather than a diagnosis. The term colic can encompass all forms of gastrointestinal conditions which cause pain as well as other causes of abdominal pain not involving th ...

** Gastric torsion, or gastric dilatation volvulus *

Torsion (gastropod) Torsion is a gastropod synapomorphy which occurs in all gastropods during larval development. Torsion is the rotation of the visceral mass, mantle, and shell 180˚ with respect to the head and foot of the gastropod. This rotation brings the mant ...

, a developmental feature of all gastropods

Mathematics

Torsion of a curve In the differential geometry of curves in three dimensions, the torsion of a curve measures how sharply it is twisting out of the osculating plane. Taken together, the curvature and the torsion of a space curve are analogous to the curvature o ...

Torsion tensor In differential geometry, the torsion tensor is a tensor that is associated to any affine connection. The torsion tensor is a bilinear map of two input vectors X,Y, that produces an output vector T(X,Y) representing the displacement within a t ...

, in differential geometry *

Torsion (algebra) In mathematics, specifically in ring theory, a torsion element is an element of a module that yields zero when multiplied by some non-zero-divisor of the ring. The torsion submodule of a module is the submodule formed by the torsion elements (i ...

, in ring theory * Torsion group, in group theory and arithmetic geometry *

Tor functor In mathematics, the Tor functors are the derived functors of the tensor product of modules over a ring. Along with the Ext functor, Tor is one of the central concepts of homological algebra, in which ideas from algebraic topology are used to const ...

, the derived functors of the tensor product of modules over a ring * Torsion-free module, in algebra ** See also Torsion-free (disambiguation) * Analytic torsion (Reidemeister torsion, R-torsion, Franz torsion, de Rham torsion, Ray-Singer torsion), a topological invariant of manifolds * Whitehead torsion, in geometric topology

Other uses

Torsion field (pseudoscience) A torsion field (also called axion field, spin field, spinor field, and microlepton field) is a reoccurring feature of many pseudoscience, pseudoscientific proposals. It posits that the Spin (physics), quantum spin of particles can be used to caus ...

, a field alleged to make faster-than-light communication and paranormal phenomena possible {{disambiguation, maths