The term helicity has several meanings. In physics, all referring (perhaps obliquely) to a phenomenon that resembles a helix. See:
- helicity (fluid mechanics), the extent to which corkscrew-like motion occurs
- helicity (particle physics), the projection of the spin onto the direction of momentum
- magnetic helicity, the extent to which a magnetic field "wraps around itself"
- circular dichroism, the differential absorption of left and right circularly polarized light
In biochemistry, helicity may also refer to the amount of alpha helix represented in the secondary structure of a protein.
In chemistry, helicity may refer to a type of planar chirality.
- Helicity (Non-Profit)