The most famous outcome of his inquiries is the law known as the Weber–Fechner law which may be expressed as follows: "In order that the intensity of a sensation may increase in arithmetical progression, the stimulus must increase in geometrical progression."
Det mest berømte resultat af hans undersøgelser er kendt som Fechners lov, der kan udtrykkes således: "For at intensiteten af ​​en følelse kan stige i aritmetisk progression, skal stimulus stige i geometrisk progression".