Nietthermisch

Nietthermisch is a term used in German- and Dutch-language technical literature to denote phenomena, processes, or conditions in which heat transfer or temperature change is not the driving factor. The term is the negation of thermisch (thermal) and is used to distinguish non-thermal from thermally driven processes. In English-language contexts, the equivalent term is non-thermal.

Variations in spelling and usage occur by language. German sources commonly use nichtthermisch or nicht-thermisch, while Dutch sources use niet-thermisch. English-language texts typically adopt non-thermal or nonthermal.

Applications and examples: A major area is non-thermal plasma (nicht-thermisches Plasma in German), where energetic electrons exist alongside comparatively cool heavy particles. Such plasmas are studied for surface treatment, sterilization, and pollutant degradation at near-ambient temperatures. Beyond plasma physics, niethermisch describes processes or conditions in which heating is not required to achieve an outcome, such as non-thermal food-processing methods (cold plasma, UV-C irradiation, pulsed electric fields, high-pressure processing) and certain environmental and materials-processing applications.

See also: thermisch; non-thermal.