Chirality, also called chirality, is a concept in physics. Taking the spiral as an example, when defining its chirality, the thumb of the right hand can point to the axial direction of the spiral, and the other four fingers can make fists, so as to compare the forward direction of the spiral rotation accordingly. If the spiral is along the direction of four fingers (from the root of the finger to the fingertip) to the fingertip of the thumb, it is called right-handed; On the contrary, it is called left-handed.

This method can be realized more clearly: when viewed along the axis of the spiral, if the spiral is counterclockwise near the observation position, it is right-handed; On the contrary, it is left-handed.

Extended data:

In quantum field theory, chiral symmetry is a kind of symmetry that Lagrange quantity of physical system may have. In a chiral symmetric physical system, the left-hand part and the right-hand part of Dirac field can be transformed independently.

In this way, each term of larger daily quantity can be divided into vector part and axial part. The vector part is treated equally with the left-handed part and the right-handed part; For the left hand part, the axis vector part is different from the right hand part.

The concept of chirality not only appears in quantum field theory, but also has some uses in superstring theory. For example, the right-hand mode of Dirac field in IIA string does not have chiral symmetry, which leads to the theory can not meet the basic conditions of realistic model.

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