(film) A special effect produced physically, without computer-generated imagery or other postproduction techniques.

(cinematography) A sound effect representing a single discrete event, such as breaking glass, as opposed to ongoing background sounds.

An optical illusion whereby, when a person fixes the gaze on a particular point, an unchanging stimulus away from the fixation point appears to fade away and disappear.

A phenomenon encountered in interferometry that is elicited by rotation. The Sagnac effect manifests itself in a setup called a ring interferometer. A beam of light is split and the two beams are made to follow the same path but in opposite directions. To act as a ring the trajectory must enclose an area. On return to the point of entry the two light beams are allowed to exit the ring and undergo interference. The relative phases of the two exiting beams, and thus the position of the interference fringes, are shifted according to the angular velocity of the apparatus.

greenhouse effect

(chemistry) The labilization (making unstable) of ligands which are trans to certain other ligands.

(chemistry) The labilization (making unstable) of ligands which are cis to certain other ligands.

The effect whereby the voting preference of a neighbourhood tends to be formed by consensus based on personal connections between residents.

The supposed phenomenon by which listening to Mozart's music may induce a short-term improvement in spatiotemporal reasoning or in mental performance generally.

(quantum field theory) The effect of the Casimir force.