torsion field: bidang puntiran, disebut juga medan puntiran
torsion effect: efek puntiran, disebut juga efek torsi

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Note added at 27 mins (2009-12-10 06:10:53 GMT)
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torsion field = spin field
http://en.wikipedia.org/wiki/Torsion_field

torsion = torsi
field=ruas

A field in physics is an assignment of a quantity (vector, tensor, or spinor) to every point of the space containing it. The word torsion refers to any variable that describes rotation. Thus, torsion fields do exist. For example, an electromagnetic wave with circular polarization or the stress tensor of a solid body under torsion stress can be described as torsion fields, although such usage is rare. Spinor fields, in particular, fermionic fields, are existing concepts from particle physics and quantum field theory. However, advocates of the scientific spin field or torsion field theories claim that spin-spin interaction (itself a well-studied quantum phenomenon) can be transmitted through space similar to electromagnetic waves, does not carry mass or energy, only "information", and does so at speeds up to 109 times the speed of light.(Wikipedia)

A straining action produced by couples that act normal to the axis of a member. Torsion is identified by a twisting deformation.

In practice, torsion is often accompanied by bending or axial thrust as in the case of line shafting driving gears or pulleys, or propeller shafts for ship propulsion. Other important examples include springs and machine mechanisms usually having circular sections, either solid or tubular. Members with noncircular sections are of interest in special applications, such as structural members subjected to unsymmetrical bending loads that twist and buckle beams. See also Spring (machines); Torsion bar.

http://www.answers.com/topic/torsion