an informal photograph; usually made with a small hand-held camera; "my snapshots haven't been developed yet"; "he tried to get unposed shots of his friends"
diffusion of molecules through a semipermeable membrane from a place of higher concentration to a place of lower concentration until the concentration on both sides is equal
forming an image by the action of light on a specially coated charged plate; the latent image is developed with powders that adhere only to electrically charged areas; "edge enhancement is intrinsic in xerography"