Tankkeissa

Tankkeissa is a Finnish term that means “in the tanks.” It is the inessive plural form of the noun tankki, which can refer to a container for liquids or gases (such as a fuel tank or storage tank) as well as to a military armored vehicle, commonly called a tank in English.

Use and meaning

Tankkeissa is used when describing the location of something inside more than one tank. For example, polttoaineet ovat tankkeissa means “The fuels are in the tanks.” The word can refer to civilian contexts (fuel or liquid storage tanks) or military contexts (armored vehicles), depending on the surrounding discourse. The form contrasts with tankissa (in the tank, singular) and tankeissa serves when the subject is plural and located inside multiple tanks or internal compartments.

Morphology

In Finnish, the inessive case marks location inside something. For words ending in -ki, the plural inessive form typically appears as tankkeissa, with a stem change from tankki to tankke- plus the suffix -issa. This pattern helps distinguish singular and plural locations in descriptive or technical language.

Related forms and usage

Related terms include tankki (singular), tankit (nominative plural, “tanks” as containers or vehicles), and tankkien (genitive plural). The term appears in technical manuals, maintenance documents, and historical texts discussing fuel storage, logistics, or armored warfare, always indicating location inside multiple tanks or compartments.

See also

Tankki, tankkit, inessive case in Finnish, Finnish noun inflection.