Glossary F

Deutsch: Fischsterben / Español: Mortandad de peces / Português: Mortandade de peixes / Français: Mortalité piscicole / Italiano: Moria di pesci

A fishkill, also referred to as fish die-off or fish mortality event, describes the sudden and mass death of fish populations in a specific aquatic environment. This phenomenon is typically triggered by environmental stressors, anthropogenic influences, or a combination of both, leading to acute or chronic disruptions in water quality or habitat conditions. Fishkills serve as critical bioindicators, often signaling broader ecological imbalances that may affect entire aquatic ecosystems.

A fissile material is material fissionable by slow neutrons. The fission process and the fissile isotopes are the source of Energy in nuclear weapons and nuclear reactors.

Deutsch: Spaltung / Español: Fisión / Português: Fissão / Français: Fission / Italiano: Fissione /

A fission is the process whereby the nucleus of a particular heavy Element splits into (generally) two nuclei of lighter elements, with the Release of substantial amounts of energy.

A FIVC is Forced inspiratory vital capacity.

Deutsch: Fixierung / Español: Fijación / Português: Fixação / Français: Fixation / Italiano: Fissazione

Fixation in the environmental context refers to the process by which a substance is captured and converted into a stable form that is less likely to be mobilized or transformed within the environment. This term is often used to describe how certain elements, such as carbon or nitrogen, are assimilated by plants or microorganisms from their gaseous or soluble forms and converted into more stable, solid compounds within the ecosystem.

A Flake is Chopped up pieces of recycled plastic bottles. These tiny pieces are melted and formed into pellets, which are stretched into long fibers like thread and woven into fabric

A Flaring is the burning of waste gases through a flare stack or other device before releasing them to the air.