Glossary F

Deutsch: Frequenz / Español: Frecuencia / Português: Frequéncia / Français: Frêquence / Italiano: Frequenza
Frequency is the number of occurrences of a repeating event per unit time. It is also referred to as temporal frequency, which emphasizes the contrast to spatial frequency and angular frequency. The period is the duration of one cycle in a repeating event, so the period is the reciprocal of the frequency.

Deutsch: Fabrik / Español: Fábrica / Português: Fábrica / Français: Usine / Italiano: Fabbrica
A factory (previously manufactory) or manufacturing plant is an industrial site, usually consisting of buildings and machinery, or more commonly a complex having several buildings, where workers manufacture goods or operate machines processing one product into another.

Deutsch: Fell / Español: Pelaje / Français: Fourrure
Fur is a synonym for hair, used in reference to non-human animals, usually mammals, particularly those with extensive body hair coverage. The term is sometimes used to refer to the body hair of an animal as a complete coat, also known as the "pelage".

Deutsch: Fossil / Español: Fósil / Português: Fóssil / Français: Fossile / Italiano: Fossile
Fossils (from Classical Latin fossilis, literally "obtained by digging") are the preserved remains or traces of animals (also known as zoolites), plants, and other organisms from the remote past. The totality of fossils, both discovered and undiscovered, and their placement in fossiliferous (fossil-containing) rock formations and sedimentary layers (strata) is known as the fossil record.

Deutsch: Filter

In the industrial and industry context, a filter is a device or system that is designed to remove or separate unwanted substances or impurities from a fluid, gas, or material. Filters are used in a wide range of industrial applications to improve the quality, purity, or safety of products and processes.

Deutsch: Schaum / Español: Espuma / Português: Espuma / Français: Mousse (physique) / Italiano: Schiuma
A foam is a substance that is formed by trapping pockets of gas in a liquid or solid. A bath sponge and the head on a glass of beer are examples of foams. In most foams, the volume of gas is large, with thin films of liquid or solid separating the regions of gas. An important division of solid foams is into closed-cell foams and open-cell foams.

Deutsch: Faser / Español: Fibra textil / Português: Fibra / Français: Fibre / Italiano: Fibra tessile

Fiber (from the French fibre) is a rope or string used as a component of composite materials, or matted[disambiguation needed] into sheets to make products such as paper or felt. Fibers are often used in the manufacture of other materials. The strongest engineering materials are generally made as fibers, for example carbon fiber and Ultra-high-molecular-weight polyethylene.

Deutsch: Familie / Español: Familia / Português: Família / Français: Famille / Italiano: Famiglia
In human context, a family (from Latin: familia) is a group of people affiliated by consanguinity (by recognized birth), affinity (by marriage), or co-residence/shared consumption.